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Old 03-26-2020, 11:17 PM
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I’m thinking about redoing the plumbing on my boat with PEX.

Anyone have experience with Sharkbite fittings? Are the standard brass fittings good for marine use? I guess they’re lead free. Or would polymer fittings be better? What fittings are you using?
Old 03-26-2020, 11:51 PM
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Have no long term experience. Brother in law just redid his house plumbing with pex and poly fitting. Only bad I saw was pex deterates in sunlight.time will tell how it will hold up over time. streach tool for poly fitting was not cheap but easy to use. Long runs go real fast. Took us like 2 days to replace all water lines once we got all the copper out.
Old 03-26-2020, 11:53 PM
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Great stuff.
Have used it on several projects and one of my boats fully fresh water system plumbed with it.
Did live well and fresh water systems in another boat as well
I used the Shark Bite fittings. I used push type fittings in applications where I thought I would need to service because they are removable. I used the crimp style otherwise. Great pipe, can turn a lot of corners without need for fittings unlike PVC. The fittings never leak. Repairs are a snap. Cut the pipe and crimp in a new piece
At the time Shark Bite was the only product out there. I see others on the market now
good luck
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Old 03-27-2020, 01:18 AM
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Get the heavier walled tube if it's an option.My rev's plumbed with the stuff and does take a beating.My only problem with it the last few years has been some minor freeze damage.
Old 03-27-2020, 01:33 AM
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There are a number of You Tube videos from This Old House using PEX. Might be worth your time to watch some of them. Great choice BTW.
Old 03-27-2020, 05:53 AM
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Pex A is the best.There are several types of Pex and they don't mix well.
Old 03-27-2020, 05:56 AM
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My boat is all pex and all compression fittings. I don’t know about shark bite though. I have never trusted them never mind on something that is constantly moving around.
Old 03-27-2020, 06:52 AM
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Buy or rent an uponor tool use the poly fittings DO NOT expose to sunlight !
Old 03-27-2020, 06:56 AM
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My freshwater system is all PEX with compression fittings. No issues. Makes pump change-outs much easier.
Old 03-27-2020, 07:21 AM
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Originally Posted by Lorne Greene View Post
My boat is all pex and all compression fittings. I don’t know about shark bite though. I have never trusted them never mind on something that is constantly moving around.
I agree that shark bite fittings seem like a bad idea on something that moves as much as a boat. I would use crimped SS bands.
Old 03-27-2020, 07:25 AM
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Before PEX was a marine product by Whale that many many boats have installed and the fittings are plastic w stainless, better than sharkbite for salt air environment
Whale_quick_connect.pdf
Old 03-27-2020, 07:32 AM
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Originally Posted by muskamoot View Post
Pex A is the best.There are several types of Pex and they don't mix well.
Yes, use Uponor for sure!
Old 03-27-2020, 08:42 AM
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I used Pex from house to bulkhead. Biggest issue was using the crimp rings and the tool I bought. I recommend you start crimping and make sure the ring is where you need it. Before the final crimp "umph" the ring can slide on the Pex. Move If you missed the mark. I used a Dremmel tool and cut off wheel to cut the crimp "bow tie" and try again.
Old 03-27-2020, 09:12 AM
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I haven't put any on the boat, but my pier is plumbed with PEX and all Sharkbite fittings.

I have never had a single problem with the fittings and I use both the push type and the regular brass fittings. The PEX pipe is prone to dry rotting and cracking especially during the winter as it ages. it is exposed to the elements all the time though. I can always count on a leak come Spring when I turn the water back on at the pier.

Oh, and I went to a local pawn shop and bought the crimp tools and remover for all of the different types of crimp rings. They had a bunch of the PEX tools for a fraction of what the stores charge. Just in case you want to check that out.

Last edited by ronyon1; 03-27-2020 at 09:22 AM.
Old 03-27-2020, 09:54 AM
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Look up on the web ,Pex com and there in a company that has alot of info,and carries everything you need. Got all my pex ,fittings,tool,clamps from them . Did my RV shed and cabin with it Just have most fittings accessable for th future.
Old 03-27-2020, 10:56 AM
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Pex and Sharkbite fittings are good stuff. Pex on boat (avoid sun exposure) should be good, just would probably would not use the brass Sharkbites if salt water environment.
Old 03-27-2020, 11:13 AM
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I redid all the freshwater plumbing on my boat with PEX. Used the crimp rings and plastic fittings. Get a crimper and good cutting tool from the big box store, a coil of tubing and a bunch of fittings. Pretty easy job. Also I believe the Whale version they sell at West Marine is metric and doesn't work with the fittings from the big box stores. I used these Name:  sharkbite-flashing-collars-23103cp25-64_1000.jpg
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Name:  sharkbite-pipe-tube-crimpers-23251-64_1000.jpg
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Old 03-27-2020, 02:24 PM
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As a plumber I would recommend Uponor, have install many miles of it and yes I also replumbed my boat with it. It is a type A pex. I do not know of a pex that is uv stable, that is the problem with sunlight. I have seen many a crimp rings fail in homes with moisture problem and some of the lesser quality brass fittings fail due to hard water problems. I used plastic fittings on my boat, been three years and have not had any issues.

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