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Old 05-28-2007, 01:08 PM   #1
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1979 31' Sovereign
vancouver , BC
Join Date: Jun 2006
Posts: 85
Piecemeal replacement of poly tubing & fittings?

It looks likely that I have poly everywhere (and here I thought it was PEX!).

I'm happy to embark on replacing the stuff to PEX, but I'd really like to first fix the current problem, which starts with a leaking valve.

So, can one connect PEX fittings (e.g. the Qest/Seaquest/Watts kind) on poly tubing, so that the replacement job can be done in segments? (first, fix the first leak, then find the second leak, then...). It would make it much easier for me politically if the water was available at least part of the weekend...

Also, the current tubing is 3/8", but it seems to be hard to find 3/8" PEX. Would the wise move be to switch to 1/2" when I do the changeover, or is that a bad idea?


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Old 05-28-2007, 01:22 PM   #2
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1976 31' Sovereign
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Chandler , Oklahoma
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Yes, you can do that. I had a leak in the bathroom closet of my 78 Argosy. Didn't really want to pull all the old poly when I had no problems anywhere else in the trailer. So just fixed what needed fixed and it's been working great pressured up at the lake. I would have liked to have replaced everything, but "if it ain't broke, don't fix it" was my motto. I wanted to get the Argosy to the lake since I was going out of town, so time was short and I had other fixes I wanted to work on. If I had a 34' trailer I would certainly have had to do a patch job. Get on the internet and look up PEX. There is a company here in Oklahoma that ships all over the country. They will probably have what you're looking for. I believe it's

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Old 05-28-2007, 02:34 PM   #3
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1978 31' Excella 500
Santa Maria , California
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I did a search here on airforums for polybutylene. It appears that the fittings are more the problem then the tubing. I would think that if you have enough free room to move your existng tubing around, you might be able to cut the bad fitting out and replace it with one from Seatech. They are available in 3/8" size (1/2" OD). Here is one source for Seatech fittings. - SeaTech® Fittings
If Lew (lewster) chimes in, he might be able to tell you more about weather or not the Seatech fittings will work with the polybutylene tubing. Good Luck..."Mac"
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Old 05-28-2007, 03:19 PM   #4
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1991 35' Airstream 350
Siloam Springs , Arkansas
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I have an early eighties vintage home and AS. Both plumbed with polybute. Patched some leaks in the house with PEX, then gave up and completely re-plumbed the entire house in PEX. To patch a liitle at a time is fine, you just need fittings to connect PEX to polybute. Lowes has a good selection. The fittings were a problem with polybute, but later study shows the cholrine breaks down the piping over time, too. As most of the leaks in my house were mid-pipe, not at the fittings, this seemed true. Good Luck!
Jeff & Cindy
Hunter RIP

'09 27FB Flying Cloud
'91 350 LE MH
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Old 05-28-2007, 05:24 PM   #5
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Someone called?

You can use the Sea-Tech fittings on any of the following of the same size: copper, PEX polybutelyne, polypropylene, CPVC. As long as the outer diameter is consistent between the tubing, you can join dissimilar materials with no problems. That's the beauty of the stuff!
Lew Farber...RVIA Certified Master Tech...ABYC Certified Master Marine Electrician
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