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Old 07-13-2012, 02:38 AM   #1
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Repacing Polybutylene (PVC) leaky pipe with PEX Plumbing

We have a 1999 Fleetwood Southwind 35S Class "A" RV with one problem: it has a water line leak in the fresh water (cold) intake line underneath the floor. It seems as if the leak is coming from an elbow joint under the floor in the crawlspace area of the coach between floor and subfloor. I was thinking of how to get under the floor and repair it, but right now all I am doing is thinking because I'm too chubby to fit in the luggage compartment! (darn the bad luck). It seems as if the elbow for the waterline is cracked or perhaps was rubbing over the years when we were driving and maybe it wore through the pipe? It leaks under pressure from the water pump (drips) or under pressure from the city water connection. In fact, it drips faster under higher pressure of city water... The pipe seems like the older white PVC pipe (1/2 inch?). I was would like to repair the leak but was wondering if anybody out there had a similar RV problem with a Southwind 35S leaking? And of course, the idiot engineering on the plumbing was concentrating on how fast they could build them, not how much a pain in the Hynie it is to service them when they ran the elbow joint up into a transverse pan under the floor of the bath shower pan!!! No way to get to it to fix it. Do you think I could abandon the line and run a new PEX line ad tap into the same plumbing and somehow cut off and cap the old pipe? I'm all ears on suggestions. Thanks in advance.

F53 1999 Fleetwood Southwind 35S Class A
Manteca, CA
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Old 07-13-2012, 04:56 AM   #2
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You can replace the section that is bad with PEX pipe at each end you can get to. The old pipe is CPVC and I have had to do several repairs like you are needing to do. Good luck and keep us posted.
Mike, RVIA & RVSA Certified Master RV Technician
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Old 07-14-2012, 10:33 PM   #3
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Don't work any harder than you have to, use PEX and Shark Bite fittings. Make the connections where they are easiest for you to work at.
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Old 07-15-2012, 04:40 AM   #4
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Don't confuse PB with PVC when you go to get fittings, they are different.

I live in a house with PB...... and some Pex as I chase leaks.
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