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Old 10-21-2003, 10:34 PM   #1
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water supply crimp ring

I ask my local RV store about the alliminium crip ring that couples most of the connections on my MH,He said I should change to the new compress type fittings, O K I agree it looks easier and readily available, but he does not know how to attache a new compresor fitting from the grey pvc. I notice that the sink faucet is atache to it via plastic slip compression.Can it be glue like garden type pvc?Is it pvc or other plastic?can I just use a hose clamp I dont want to make it look like a make shift rig,I want to do right and relaible.
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Old 10-21-2003, 11:16 PM   #2
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the gray pipe is probably polybutelyne which was replaced by PEX a few years ago due to lawsuit problems (may be related to the concerns about the crimp rings as it was the acetyl fittings and compression rings on polybutyl pipe that failed causing lawsuits).

The compression fittings (Quest or Flair-it) work by sliding the nut, then the metal ring, then the gasket on the tube and then tightening the nut on whatever it gets attachted to. Don't over tighten. Most packages with these fittings have instructions with pictures.

check pexconnection.com for parts and pieces or Lowes or even your corner Tru Value hardware (probably Ace, too).
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Old 10-22-2003, 08:32 AM   #3
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I used the compression fitting on my shower connections, and went to a brass coupling instead of plastic. The I coated the whole thing with plumbers goop where the seals meet to be extra safe, as the shower is a pain to fix.
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Old 10-22-2003, 08:46 AM   #4
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the grey pipe isnt avail. lowes has has a compression ring for pex. pex is a larger diamiter on the outside and thicker wall than the grey pipe. you can compress the pex but you need the correct ring. lol
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Old 10-22-2003, 10:52 AM   #5
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Re: water supply crimp ring

Quote:
Originally posted by Lido&Linda
I ask my local RV store about the alliminium crip ring that couples most of the connections on my MH,He said I should change to the new compress type fittings, O K I agree it looks easier and readily available, but he does not know how to attache a new compresor fitting from the grey pvc. I notice that the sink faucet is atache to it via plastic slip compression.Can it be glue like garden type pvc?Is it pvc or other plastic?can I just use a hose clamp I dont want to make it look like a make shift rig,I want to do right and relaible.
FWIW, I had to replace my city water inlet/pressure regulator this summer. I tried to use the factory brass fitting on the gray pipe and only succeeded in cross-threading my $40 inlet.

We don"t have any RV dealers closer than 40 miles away, and in any event, I don't own the tools necessary to assemble this kind of plumbing. After I cleaned the plastic threads back up, I used a thread file and cut the crimp ring off of the gray plastic tubing and removed the 4" of tubing that held the brass fitting.

I replaced the 4" of gray tubing with 200psi re-inforced clear tubing and used hose clamps to secure it to the brass t-fitting and the NYLON fitting supplied with the inlet. It went back together quickly and easily. It may not look 'factory' but it's inside a metal cabinet under the exterior of the trailer, and no one will see it until the next time (hopefully after I'm long gone) it needs to be replaced. Further the plastic tubing has a greater pressure rating than the gray pipe it replaced.

Roger
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Old 10-22-2003, 11:44 AM   #6
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Quote:
pex is a larger diamiter on the outside and thicker wall than the grey pipe
I don't think this is true as the tubing for water (copper or plastic) is measured by its OD. (see http://www.cerrocu.com/cda/book.html
)

There may be some expansion with age but my experience is that I can use the Quest or Flair-t compression fittings on copper, PEX, or polybutelyne without too much of a problem. 3/8 tubing and half inch fittings are what I use most often. The 5/8 OD and 3/4 fittings need a bit more care to keep them from failing.

The crimping tools, if you want to go that way with PEX, can be rather expensive. A 'screw tite' version is about $20. You can also often rent them from Lowe's. Crimping connections in tight spaces can be a pain so preassembly is a good idea if possible.

Hose clamps on polybutelyne or PEX seem to not be favored because they can't provide the pressure that a proper crimp ring can and this tightness is needed because of the wall thickness and properties of the pipe.
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Old 10-23-2003, 07:58 PM   #7
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Yes,the tubing is more like a 1/2 OD I measure it.So Iwill try using a i/2 inch compression fitting it should work,the supply to the sink is a plastic comp. going in to the sink faucett hot and cold.the one I'm doing is the supply to the water filter it was crimped to a elbow fitting to the filter.
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