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Old 12-06-2018, 22:31   #1
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PEX for raw water

Is anyone using, or have any thoughts on using PEX in a below water line application on a raw water head?

Iíve been slowly replumbing the fresh water side of the boat with 1/2 inch wirsbo (Uponor) so Iíve got the tools. Read a bunch of threads on the forum, but it seems like PEX is only talked about within the constraints of the fresh water system. Is there any reason why I should not use some 3/4 to go from thruhull to pump to head? Or for that matter, anywhere else? Sump? Tank vents?

Thanks.
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Old 12-06-2018, 23:02   #2
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Re: PEX for raw water

The modern marine sewage lines are less permeable than before. this is a huge issue with smells. If you use the wrong hose, your system will be smelly real quick. Not sure pex piping is non-permeable and for suitable for this use.
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Old 13-06-2018, 07:43   #3
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Re: PEX for raw water

nightowle Thank you for your reply.

Let me clarify though, I am definitely NOT talking about black water (toilet discharge). I'm mean on the intake side Ė sea water, and grey water on the shower sumps, or sink drains. I suppose what I'm asking is there any reason to not hook PEX up to through-hulls below waterline?
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Old 13-06-2018, 08:30   #4
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Re: PEX for raw water

Quote:
Originally Posted by Dartanyon View Post
nightowle Thank you for your reply.

Let me clarify though, I am definitely NOT talking about black water (toilet discharge). I'm mean on the intake side Ė sea water, and grey water on the shower sumps, or sink drains. I suppose what I'm asking is there any reason to not hook PEX up to through-hulls below waterline?
It sounds crazy... but the inlet lines on toilets will also permeate. Very small creatures are suspended in the seawater and will build up causing stink. I know as I chased a stinky hose problem for 5 months before replacing the inlet hose, solving the problem.

However, a bigger issue to me would be getting a proper PEX connector attached to the through hull. PEX is not designed to use a standard "barbed" connector, but to use a proprietary PEX connector (has ridges instead of barbs). Maybe you can find a PEX connector that screws into a standard thru-hull fitting.
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Old 13-06-2018, 09:06   #5
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Re: PEX for raw water

That’s an interesting question. My gut says don’t do it as it has no reinforcement and is more likely to crack than real marine hose. Also as pointed out by travelerw, it might be difficult to make the connection.

Having said all that, I have no problem using it on fresh water systems.
If you try it, let us know what happens.
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