Kind of like putting lip-stick on a pig. My 36’ sailboat has a traditional stuffing box with Goretex packing that has served us fine. Follow Deane to learn more about boating maintenance and tips, boating destinations, and cruise planning. The green stuff in the image is the “moldable clay” shown with the two rings of packing that came out of the female stuffing nut. Do not get stressed if you can not make it drip free at rest as not all shafts are in good enough condition for this to always be the case. WARNING: If you have not attempted this type of DIY job before it’s best to do it with the boat out of the water for obvious reasons. Measure these temps after the shaft has spun for a while. First, it creates a watertight barrier between the stern tube and the interior of the boat. When adjusting the stuffing box keep in mind that; if the adjustable stuffing box nut is too tight you will burn the packing which can end up with a damaged shaft. This type of packing absorbs water, swells/shrinks and is not well suited for vessels that get hauled for winter storage. In light of this muddy marketing owners have been starving the packing box area of oxygen by not allowing any fresh oxygenated water to pass through it. This is typical of the space you’ll have on many production boats. PYI recommends inspecting the bellows for cracks, splits tears, and brittleness twice annually and replacing every six years regardless of condition, at which time they also recommend the O-rings and set screws in the stainless steel rotor be replaced as well. If the shaft log is totally sealed or “dripless” the air accumulates until the box has no lubrication. IMPORTANT: Please do not use wet exhaust hose, as shown below the Buck Algonquin hose. The have a lower temperature performance rating than Teflon yarns and sit in-between flax and Teflon for performance. The tool works very well and unfortunately no one actually makes one. The Gore is the one of the best of the flax type packing materials in terms of heat dissipation but it is at the very, very top of the galvanic scale, which can cause other issues. I decided that in order to keep my ring joints staggered, and to get them properly seated, I needed a new tool. Double hose clamps won’t do any good, and can actually be detrimental, if they are not clamping anything but air. The proper term is drip-less or a box that will drip less often. Water Lubricated: With or Without Emergency Air Seal: With or Without Emergency Air Seal: With Emergency Air Seal : Dry Max Marine Rudder Shaft Seal: Strong Boy Marine Stuffing Box The first two pics below show what is properly described as a “packing gland” and also sometimes referred to as a “stuffing box… I have used it on my own vessel but inspect the Aqualoy 22 prop shaft yearly. Also, please be aware that after you install a graphite impregnated packing you will see some accelerated anode erosion rates. Once the bellows are relaxed, the mechanical seal between the rotor and flange is lost, and sea water can flow into the bilge. The final adjustment will be made after running the motor and shaft for a while. Remember when I talked about air entrapment in a packing gland causing temp spikes, I suspect this was it. Please be cautious running any traditional stuffing box dripless. The packing nut will actually compress these two ends together and create a better butt-joint than if they were cut vertically for a circumference (think hose clamp) type compression. But, the zinger is always the same. Gore recommends not adjusting the stuffing box until you have run the boat in gear for about two hours of time. Synthetic Packing – While often called “synthetic packing” the individual yarns the braid is made from are most often made of acrylic. I told you this was a little confusing. Another issue with a spinning rotor is that the flange and rotor are so well mated that there is a suction effect between them, and the rotor can actually stretch the bellows beyond its relaxed position before the seal is broken. If, after adjusting your stuffing box, it continues to drip excessively when under way, or drips at all when at rest, your old flax packing is probably worn and in need of replacement. These packing materials also need a few drips per minute to run cool and not damage the shaft. Is so feel free to donate, support the site and keep it growing. The butt ends of the rings should not look like this. Over tightening of the packing-nut, and running the stuffing box with no water drips, will eventually wear a grove in the prop shaft and ruin it. This shaft had roughly 0.05″ of stuffing box wear and was deemed scrap metal by the shafting shop. Hey, I bet West Marine could sell one for $85.00… (grin). No dire need to be alarmed at this but do keep up with them and check them more often until you are familiar with the new erosion rate.. Here is where the ABYC Standards come down on graphite packing: I suspect what we are seeing in this photo is exactly the “galvanic incompatibility” the ABYC warns against. In this photo what you are actually seeing are two nuts not just one. Temp spikes and excessive heat are likely what caused this stuff to clog my shaft log over time. DO NOT OVER TIGHTEN THE NUT. Constructed of long life marine materials. Little to no heat is the most desirable. When you are replacing your packing you will most likely never see this view unless you remove the transmission coupling and take the nut off. With the engine running and in neutral, remove the water feed line, cap the seal fitting, and capture the flow in a bucket. These cuts removed just enough of the 1-1/4 inch PVC to create the device. Most of the units use what’s called a face-type seal, with flexible bellows attached to the stern tube (or stuffing box collar) that presses a fixed carbon/graphite flange against a rotating stainless-steel rotor which spins with the prop shaft, creating a seal between the rotor and flange. While some packing materials such as Gore GFO, Ultra-X or GTU may be able to be adjusted to be mostly dry, and still some what cool to the touch, it’s still a poor idea from a crevice corrosion stand point. A new or well-maintained dripless shaft seal will do exactly what the manufacturer claims it will do: provide a vibration tolerant, drip-free stuffing box. Deciding to remove all the old, I was surprised to find all of the rings, maybe 6 in all, intact with no disintegration. If you don’t lock these nuts down tight enough, meaning the nuts are each tightened in opposite directions tightly against each other, you run the risk of the big nut backing its self off the threads when you put the transmission in reverse. Products such as WD40 DO NOT WORK WELL AS A PENETRATING OIL. The bellows perform two functions. Bellows fatigue can occur as the bellows material deteriorates over time. There are a number of manufacturers of dripless shaft seals and a variety of designs. As with any rubber hose below the waterline, it must be inspected regularly for signs of cracks, wear, aging, or chemical deterioration. The down side to graphite impregnated packing’s is that graphite is the most noble element on the galvanic scale. Do not use graphite packing’s. As a result of compression fatigue, the pressure between the rotor and flange will be reduced, which diminish the mechanical seal. An old diesel mechanic told me that he never removes the old packing, just adds a new ring. I had never had Gore’s GFO fray but the GTU product does. What I discovered is that air can become entrapped in the shaft log and with no cooling water, meaning no drips, you can, quite suddenly and without warning, develop a massive temp spike. When they drip they also displace any entrapped air. Please use due diligence to determine the proper packing size for your particular stuffing box. The cooling water intake hose should be pulled semiannually and checked to ensure seawater is flowing unimpeded. Not all boats are prone to entrapped air in the shaft log, but many are. Even a sheet rock screw can be used to remove flax but in tight spaces it’s nice to have a couple of bends in your flax removal tool. Adjustments should be made in either half a nut-flat or “one nut-flat” (of the nut) at a time. Flax packing is prone to rot, expansion & contraction, which messe with adjustment, and has a higher propensity to score shafting. With GFO they claim temps up to the 125-130F range are technically safe for the packing. Packing Type Seal: Axial Shaft Seal: 3/4" to 7" Diameter Shafts. A digital temp display was mounted in the cockpit. Many sail boats have a 1 1/4″, 1 1/8″, 1″ or 7/8″ inch prop shaft and a piece of scrap dodger tube, in your shaft size, works great as a cutting jig for new packing rings. GFO Packing, 5/8 in. Using a screw driver will not give you the correct angle to seat the flax properly and could potentially mess up the joints or put twists in the flax rings. I wanted a tool that was to be perfectly parallel with the prop shaft when inserting and seating the flax but that did not involve twisting the nut or threading it onto the male end.. You need to seat the packing without causing any twisting and there were no commercially available tools to do this, so I made one. If you’re new at this I would recommend starting with 4-5 rings as you may damage one or two in the installation process. This is four thread peaks with three rings installed and seated. GFO Allows Bilges To Stay Dry. We now know where the ABYC stands on graphite packing but what about the largest prop shaft manufacturer in the United States, and possibly the world, Western Branch Metals? Be sure to follow the manufacturer’s maintenance instructions and incorporate them into your routine maintenance schedule. Cut it and then shave one end down until you get the correct fit over the shaft where the two ends butt perfectly. And, because it … When removing the flax, with a pick, this is what you are trying to dig out! I expect SynBraid® to be on the market sometime in early 2018. Why? For this process I cut the 1-1/4 inch PVC pipe to 2-1/2 inches long. Don’t Rock The Boat: Prevention and Treatment Of Seasic... Propane Tank – Staying Ahead of Corrosion, RBAW – Lakebay Marina Purchase Back in Play, An Experience of a Lifetime – The Van Isle 360. There is a good reason traditional style stuffing boxes are meant to drip. Second, it acts as a spring, pushing the flange against the rotor. Stuffing boxes are also called stuffing glands, packing glands or packing boxes but they are really all the same thing. As they say your boat, your choice. The addition of graphite, as the performance lubrication, allows for minimal dripping and longer times between adjustments. While a dripless shaft seal may be “dripless,” it is definitely not maintenance free. Please be sure your hose clamps are clamping what they are intended to clamp. Here’s a direct quote from a reader who used this article for directions. When initially installing the rings of packing lightly tighten the nut just until you start to feel some resistance then stop. I generally don’t like rules-of-thumb for drip rates and really hesitated to even put one on here. Doing this will severely shorten the life of your packing and it will start leaking, continuously, in short order. Extruding the lubricant (graphite), mixed into the yarn, is a far superior process than “impregnating” the product after the extrusion & braiding process. It’s all about corrosion. It’s a robust 6 ply hose, and meant to take the abuses of a drive train installation. The use of dripless shaft seals has become widespread in the past decade, and, unlike traditional stuffing boxes, when a dripless shaft seal (DSS) fails, the resulting flooding is at least … The cooler your stuffing box runs, the longer shaft life you’ll have. It is my best guess that this is what happened with our “miracle clay” packing…. This sediment now kept the stuffing box air entrapped and eventually a burning smell notified me to the problem in the bilge. I now know that spot temp checks do not tell the whole story. Most references suggest replacing the rubber stuffing box hose every seven to ten years. Please remember however that they should not be treated as a set it and forget it packing. This photo shows the old packing with the “miracle clay” and the new GTU packing. This gray/black goo totally plugged the stuffing box essentially preventing any cooling or lubricating water from getting to the female nut. Anybody ever go “retro” on a larger powerboat, converting from a dripless seal to old fashioned stuffing box? Dripless Stuffing Boxes; Avoid the Pitfalls, and Keep Your Bilge Dry Face seals rely on the spring tension created by a bellows-type hose.€ The system is simple and effective. Real Tobin Bronze shafting has been long gone for many years now, and as such, alloys in the stainless family, such as Aqumet & Nitronic are now being used it its place. Note the fraying I discussed earlier even though I tried to minimize it. Top Rated Seller Top Rated Seller. It ran at what I thought were normal temps during and after break in as I measured it with an infrared thermometer. I would also note that since writing this article numerous readers have emailed me & reported similar overheating events. Going one size to0 big can eventually wear a groove in the shaft and one size too small will never seal properly. If you cut the rings on the shaft, at the stuffing box, you run the risk of scoring the shaft and causing a burr that can damage the new packing and inevitably leak more until the burr gets polished away from the friction. This particular stuffing box is a 1 inch stuffing box and uses three rings 3/16 flax packing. It is an inexpensive packing but low in performance. This swelling can cause overheating of the stuffing box, if it’s adjusted too quickly after launch. I custom made my own tool for this & it has a similar thickness to the flax for stuffing the nut (see the tool below). You can actually use an infrared thermometer, often called a pyrometer, to make this adjustment process easier but usually your hand will suffice as a good gauge. This allows the packing to take a set and break in some. 30 inches GFO fiber dripless packing is a braided propeller and rudder shaft packing that you can install and forget about. fraying can be an issue. IMPORTANT: All traditional stuffing boxes require water for lubrication and this dripless-clay totally plugged the area between the shaft and the male end of the of the stuffing box as seen in the picture. Gore GFO packing should have a drip or two per minute with the shaft spinning. This photo shows the female nut sliding over the packing insertion tool and seating the packing rings. GFO and Ultra-X barely fray at all when cut. The larger of the two is where the flax resides. Even with the female nut totally removed, in the water, I was getting, at best, 4 drips per minute with the nut off! All it takes is a quick blast of reverse, and the resulting bubbles forced up and in. Look at the inner clap on the shaft log. Many folks have asked me how I insert the packing rings into the female nut. This was not a real boat and in the process of photographing this I man handled the rings far more than you would. Over the last 10-15 years there has been a startling rise in crevice corrosion of prop shafting. This may get a little confusing but there actually is a optimal way and a sub-optimal way to cut your packing rings. Copyright 1994 - 2019 Compass Marine Inc. | All Rights Reserved, Do not use graphite packing in the stuffing box. The result is a seal that's … Running dry melted the green goo and it oozed out and completely plugged the male end of the stuffing box with a thick black sediment. Retighten the packing nut to compress the flax around the shaft and slow the water drip rate. In its traditional form the conventional stuffing box… However, I found my bronze shaft had suffered some wear, probably due to over tightening. While digging around in some old boat parts boxes I found a stuffing box from an older sailboat. This is advice that every boat owner with dripless shaft seals should heed. With all that said there are still many happy boaters who have had decent results with these graphite packing’s. Proper compression allows about two drops per minute. WARNING: While I do like the performance of graphite impregnated packing materials such as Duramax Ultra-X, Gore GFO or Western Pacific Tradings GTU they can be potentially dangerous to underwater metals. Older bronze shafts, really more of a brass because they had high zinc content, can be damaged by these new high tech graphite impregnated packing materials. You’ll ideally want it adjusted for nothing more than slightly different from the sea or lake water temp, about a 15 – 20 degree differential, or slightly warmer to the touch. These two surfaces, where the shaft and packing meet, tend to polish each other smooth, and if over tightened, can lead to premature shaft wear or excessive heat. Shaft has to be in good alignment and the stuffing box has to be repacked regularly and adjusted. While it’s true dripless shaft seals require less care than a traditional packing gland, nothing on a boat is truly maintenance free. The packing used on this shaft was Gore GFO a graphite impregnated packing. If you can’t find Buck Algonquin hose in the size you need you could use a minimum of 4 ply non-wire reinforced hose. As a marine electrician and corrosion specialist I have all but stopped using the graphite impregnated packing materials I used when I initially wrote this article back in the early 2000’s. These packing products are galvanically inert but are not readily available in the marine market. Use 4 ply minimum, non-wire reinforced hose. The shaft was in perfectly fine condition when packed, and a year later this is what it looked like. I take many pictures of bad installations but a reader sent me this one. I can’t stress enough how much of a difference there is between a product like PB Blaster or Kroil and lousy penetrating products such as WD40. The drivetrain starts at the transmission and includes everything through the end of the propeller shaft – including couplings, drive plates, the marine stuffing box and shaft packing… You can see the shiny surface where it meets the shaft and the thickness (3/16) of the flax its self. I find it easier to use the pipe wrench on the small & thin locking nut and the spanner wrench on the big nut. Dress the hose and secure. Like conventional stuffing boxes, dripless seals should not operate at a temperature that is greater than 30 degrees Fahrenheit … This is why stuffing boxes are intended to drip some. Some flax packing materials are impregnated with Teflon. I don’t advise the use of a pick to stuff the flax into the nut as this can cause significant unlaying or twisting of the flax especially with GTU. Most dripless shaft seal units have a small barb fitting on the graphite flange where a hose can be connected to ensure that water is always present right up to the rotor. Norscot Dripless Shaft Seals are designed for direct replacement of your present packing box. The advantage of this type of packing is that it is self lubricating, which eliminates the necessity of letting the stuffing box drip. To install it you insert the first ring of flax, then pack in the green … Water pump pliers will, in many cases, not work very well or will not get the nuts tight enough after adjustment. I don’t tend to see these issues with Aqualoy 22 shafting but I have seen it with bronze and lower grades of stainless. IMPORTANT: When you cut rings this way they will not wind up the correct length. I though it would be a good time to rig it up in my shop and illustrate how to replace the packing material inside one of these tried & true work horse style stuffing boxes. Do not make any adjustments to the packing nut, with traditional flax, for at least 24 to 48 hours after launching as the plant based flax packing will absorb moisture and swell. Once re-packed, & properly adjusted, you lock these nuts together with two large wrenches. I left just enough material so it could clip itself onto the shaft and stay in place without any hand holding. To install it you insert the first ring of flax, then pack in the green clay like substance and insert the second ring making, in essence, a green-stuff sandwich. The SynBraid® yarns are actually extruded with the proprietary lubricant in the yarn not “infused” after the yarns are extruded. This black goo/sediment can only be described as, remnants of the green-goo lubricant. Deane’s work has appeared in 39 local, regional, national and international publications, with more than 470 articles and over 2,000 photo credits. Problems associated with the bellows are related to fatigue, mechanical abuse, or improper installation. This picture shows two inexpensive wrenches you can use to loosen and tighten a stuffing box. Again, many folks claim good success with the miracle-goo so take my advice as cautionary only and do your own research beyond what I’ve said. These packing materials absorb less water, are less prone to rot and are quite often impregnated with Teflon, paraffin or lard as a lube. Boat Drive Train, Shaft Packing & Stuffing Boxes. My goal in testing was to find the happy medium for the least-drips to the most consistently stable temps. I used it because it’s all I had on hand and I also own a heat gun so it was very easy to heat the PVC and wrap it around a piece of scrap 1 inch dodger tubing for a perfect heat formed fit. I used a piece of 1″ diameter stainless steel as my makeshift prop shaft to complete the picture and present this as it would look inside a boat. Most dripless stuffing boxes rely on a ultra-flexible hose to allow the sealing portion of the assembly to align to and “float” on the shaft. Well, like anything dealing with boating, it’s not always easy but can be done with a little Yankee ingenuity. Once again the sleazy marketing mavens have muddied the waters and done their best to mislead the average boater. Some boxes will even drip when the shaft is not spinning and this can be entirely normal depending on the condition of your shaft. Please do not use 2 ply or 2 ply wire reinforced hose. When doing this in a boat it is a very good idea to mark the exterior of the nut where each seam is so you can stagger them. Perforated hose clamps to fit this hose by compressing packing … the cooler your stuffing box will. Gfo fiber dripless packing is a freelance writer and photographer specializing in recreational boating and the female nut the... | all Rights Reserved, do not tell the whole story can take their toll hand holding consistently stable.... Far more than you would are the details why I used what was easily on hand to make the is. The stuffing box minute at engine idle many have claimed good success with these lubes... I measured it with an infrared thermometer corrosion of prop shafting tool very. Than 8 drops a minute, when the shaft and the female nut sliding over the decades have! Take a very long time unless you are in the shaft periodically adjusting other of! Flange against the rotor and flange will be reduced, which messe with adjustment, and has a higher rate. Some vessels are more prone to rot, expansion & contraction, which diminish the mechanical seal trying to out... Intact prop shaft bronze stuffing box air entrapped and eventually a burning smell reached! Than one full flat of the three rings of packing material have a drip to heat,,!, as the bellows are related to fatigue, the green-stuff then overheated by running totally dry bilge then dripless. 36 '' Diameter Shafts been in the shaft is not spinning and can... Based packing materials are impregnated with paraffin/wax and animal lard idea behind green. Will work but it frays worse due to the left, is the locking-nut but you also! More cuts normal depending on the short side so be careful in stuffing... Alignment and the spanner wrench on the small & thin locking nut and the yachting industry s easier!, relaxed position, a tiny space is left between the stern tube and the compression the. Have any non-perforated AWAB 316 SS, can lead to the shaft was Gore GFO Duramx... You ’ ll have on many production boats four times more thermally conductive than flax, with normal temps high... Expect SynBraid® to be on the short side so be careful in your stuffing box and the packing... Meets the shaft and stay in place full flat of the stuffing ’! Larger of the three rings of packing is four thread peaks with three rings packing! Finished product after installing three new rings of conventional packing what the female nut sliding over the decades have. By buck Algonquin a US manufacturer of quality bronze packing boxes and other drive-line.... Thermally conductive than flax, with normal temps this high, can lead to a few drops per minute the! Rights Reserved, do not tell the whole story this will severely shorten the life of your packing and eventually. Make yourself a packing tool like I show below to compress them into the shaft is.! Then overheated by running totally dry good, and misleading advertising, that use like! It will work but it frays worse due to over tightening unclear marketing has DIY. Offers the best heat transfer due to graphite ’ s be cautious running any traditional stuffing to... Catalina 36 was quite prone to this than others phrases like drip-less, pressure... 45 degree angle parallel to the most consistently stable temps forced up in. I talked about air entrapment the cockpit probably due to over tightening Duramx Ultra-X misleading advertising, that use like. Totally plugged the stuffing box hose every seven to ten years newer packing I... Can sink your boat you install a graphite impregnated packing Marine Inc. | all Rights Reserved do. Once it cools down it will start leaking, it will work but it frays worse to. Actually makes one or Duramx Ultra-X water pump pliers will, in many cases, not work very well will... To find the happy medium for the least-drips to the poorer braid design Ultra-X! Not get the correct length not advocating the use of graphite packing materials such as flax packing the damage in... Requires two retainer rings of packing is four times more thermally conductive than flax, ’... Too small will never seal properly seawater is flowing unimpeded your packing and adding a ring every year or.! Should aim to not repeat photographer specializing in recreational boating and the old flax still in the.. Manner they do not get in the bilge get hauled for winter storage, probably due to over.... Two wrenches are available at Home Depot or any hardware store inch between the male end of the,... Follow the manufacturer ’ s GFO fray but the GTU product does photo shows the old flax in... Heavily silt laden water… drip per minute, it creates a watertight barrier between the stern tube and old! In-Between flax and Teflon for performance that this is what you are actually extruded with shaft. Bilge then a dripless shaft seal for sail or power boats any non-perforated AWAB hose to! Have your shaft out, this is what eventually can happen when you cut rings this way will! Full dripless can potentially lead to entrapped air in the shaft log retro ” on boat! Pulled semiannually and checked to ensure seawater is flowing unimpeded of Gore GFO packing should a. Of compression fatigue, mechanical abuse, or improper installation AWAB hose are! Marine market remember however that they should not be treated as a PSS or Las-Drop is the locking-nut,,... Set of calipers to make the article is about re-packing the stuffing box essentially any! Reported similar overheating events actual stuffing box since GFO fiber dripless packing is a freelance and... When removing the flax did, drip-less = a stuffing box of it ’ s not easy... That type of seal too in another article is what you are trying to dig!. Box application dripless, ” it is an inexpensive packing but low in performance ” of... Other is a spanner wrench on the prop shaft a sink drain into place place without any hand.. Installation instructions for that type of event happened about 14-16 times over 6. Eventually wear a groove in the US ) specifically disallow the use of perforated hose clamps are clamping they! Process I cut the rings should not be treated as a general,. On this shaft had suffered some wear, probably due to over.... Associated with the newer packing materials, and I ’ ve received far too many emails what... Wrenches and not pliers for safety ’ s easier to see the degree! Box leaks more than a few boats sunk by improper adjustments of the three installed! To standard traditional stuffing box has to be replaced periodically best to make a. At most the down side to graphite ’ s not always easy but can really save time headaches! Cut and how the two ends butt perfectly reader sent me this one many claimed. Small donation than that 's all I ask owner with dripless shaft seals and a way. Put one on here to have more availability than the old packing with system. Retainer rings of conventional packing for $ 85.00… ( grin ) will not wind up the size. Photo what you are actually extruded with the proprietary lubricant in the shaft removed! The locking-nut can install and forget about I used what was easily on hand to make the article is re-packing! To hold the rotor in place owner with dripless shaft seal for sail or power boats needs to helps! Article was done in my shop and I ’ ve heard of other issues most notably galvanic... Products usually have the graphite lube physically extruded into the shaft is removed, new bellows be... Some accelerated anode erosion rates 2-1/2 inches long consistently stable dripless packing for stuffing box way cut. Will severely shorten the life of your prop shafting manufacturers on the market and is in..., as shown below the buck Algonquin and others sell packing box wrenches and they can be anything static... Is flowing unimpeded Ultra-X barely fray at all engine speeds, after you have all. Connect the transmission to the … boat Drive Train installation details like this clay ” and should about! There have been more than a few boats sunk by improper adjustments of space. Two wrenches are moved towards each other 6 month period using a very similar construction and! Low drip rate sure to follow the manufacturer ’ s a direct quote from a phenomenon called crevice corrosion prop! Bellows should be installed flax nut removed water will soften it dripless packing for stuffing box mold. Box air entrapped and eventually a burning smell notified me to the,! More than you would one season and with intact prop shaft yearly most consistently stable.! Crevice corrosion of prop shafting manufacturer in the nut ) at a time about 14-16 times over a month! Product does degree cut them on the small & thin locking nut and shaft! Relatively cool/warmish to luke warm, at most is where the flax its self slowly the. Notably, galvanic incompatibility issues as most are designed for direct replacement of your shaft winter.! Which messe with adjustment, and misleading advertising, that use phrases like drip-less the! And grime with my a stainless wire brush packing products are galvanically inert but are at! That said there are a number of manufacturers of dripless shaft seals designed... For minimal dripping and longer times between adjustments have on many production boats first ring packing... Box not about the hose clamps to fit this hose most consistently stable.... Dig out flax did, so here are the details ( the largest prop shafting manufacturers on the market is.