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Old 09-16-2021, 05:55 PM   #1
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Capped water lines leaking!

Hello! I'm new around this site and hoping this is a good place to get some advice.

I cut and capped the pex water lines that were for the toilet and bathroom sink. I'll be making a compost toilet and I didn't need a bathroom sink.

I used what I think are the correct size compression caps for the lines. When I turn on my water pump water sprays wildly from the side by side sink lines especially. I don't think the toilet line leaks at all.

Thinking it's possible my cuts were a little off so going to get my hands on some pex cutters and see if that helps. If anyone has any ideas as to what the problem is here I'd be happy to hear it!
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Old 09-16-2021, 06:10 PM   #2
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Welcome to iRV2 .

Sorry your first post is about problems .

It would appear from your photo that your plastic water pipe is grey and if memory serves the gray pipe takes different fittings that clear pex .

Always best to use the pex cutter for square cut . But you may want to check with the cap supplier to see if they are the correct for your grey pipe.
What year is your RV ? The grey pipe was only in use for a few years in the late 90's.
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Old 09-16-2021, 06:51 PM   #3
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When you say compression caps, do you mean something like a SharkBite cap that you push on?

It actually is very important to cut that with the correct tool, you need a very square, clean cut. Also those two pipes coming out of the wall are cut so close to the wall, I wonder if you actually pushed the caps on far enough. The PEX may have pushed back into the wall as you were pushing the cap on.
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Old 09-16-2021, 07:19 PM   #4
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Quote:
Originally Posted by Skip426 View Post
Welcome to iRV2 .

Sorry your first post is about problems .

It would appear from your photo that your plastic water pipe is grey and if memory serves the gray pipe takes different fittings that clear pex .

Always best to use the pex cutter for square cut . But you may want to check with the cap supplier to see if they are the correct for your grey pipe.
What year is your RV ? The grey pipe was only in use for a few years in the late 90's.
QUEST Piping...grey Polybutylene pipe
Different then PEX pipe

Go to Home Depot and get SharkBite PEX transition fittings to Polybutylene Pipe to cap off those lines

SharkBite PEX Transition fittings with a gray collar are compatible with polybutylene pipe.
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Old 09-16-2021, 08:49 PM   #5
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Quote:
Originally Posted by Old-Biscuit View Post
QUEST Piping...grey Polybutylene pipe
Different then PEX pipe
.
Thanks Old-Biscuit , I couldn't remember the name ( let alone the spelling ) of the pipe . I do remember my last house insurance policy said if there was any of it in my house , my deductible for a plumbing flood would be $5,000 , not the regular $250 of the rest of the policy .
I guess I should have pulled out the policy for the spelling.
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