How do I keep bathroom plumbing fittings tight? - Escape Trailer Owners Community

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Old 07-25-2017, 10:25 AM   #1
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How do I keep bathroom plumbing fittings tight?

I am having a recurring problem with my cold water line coming loose and spraying the bathroom with water. Fortunately I have been in the trailer when this has happened and was able to shut off the pump. Also, during the winter I installed ball valves on the lines to isolate the problem. But I don't know how to keep that fitting from working itself loose. Any suggestions?
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Old 07-25-2017, 10:31 AM   #2
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cold water supply on the sink or on the toilet?
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Old 07-25-2017, 10:37 AM   #3
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Haven't heard of this one before. Are you wrapping threads with teflon tape? Get the heavy duty tape, usually Grey, and overwrap it then tighten down. Would think that would do it.
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Old 07-25-2017, 10:40 AM   #4
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Mike, are we talking about a PEX fitting?
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Old 07-25-2017, 10:41 AM   #5
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I don't think that there are any fittings in there that require tape, which should only be used on pipe threads. Might be though, but my trailer is nowhere near to check.

Where is the joint loosening, Mike. This leaking is not a normal thing. A picture might be nice too.
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Old 07-25-2017, 11:20 AM   #6
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My 17b had threaded connections to the fixtures, but ur right they may have eliminated them. I haven't had any cause to look on the 19 yet. PEX was coming off he wouldn't be able to hook back up without special tools or shark bites.
If there are threaded connects to the fixtures you don't usually need teflon tape, but it can be used to tighten a connection
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Old 07-25-2017, 01:46 PM   #7
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It's the screw-on fitting that goes onto the threaded plastic pipe nipple that comes down from the cold water tap on the bathroom lavatory. It is PEX line so I guess these are PEX fittings. I had trouble with both lines before so I cut them and installed valves beneath them, then screwed them back into place.

Here is a crude, dark photo from a cheap cellphone. As you might be able to see, I've used a PTFE paste thread sealant on it, which might have contributed to the problem. I should probably use tape instead.
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Old 07-25-2017, 01:56 PM   #8
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Mike I think that is a compression type fitting if it is the same as our 21' and tape of putty will probably prevent if from properly sealing.
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Old 07-25-2017, 02:18 PM   #9
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That is exactly what I was expecting to see. Compression part of the fitting is at the bottom of the threads. If you use teflon tape and wrap the threads up higher it will tighten it up and will not interfere with the compression seal.
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Old 07-25-2017, 02:29 PM   #10
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Tape should not be used on that fitting (unless I am seeing it wrong on my phone). It is a compression fitting. The threads only hold it in place. Adequately tightened that fitting should not leak, unless there is something wrong with it, then it needs replacement.

Don't want to believe me, give any plumber a call. I know our plumbers have cussed homeowners for using Teflon take where they shouldn't.
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