| Re: [GMCnet] Plumbing question [message #232723] |
Mon, 09 December 2013 14:24  |
rallymaster
Messages: 662
Registered: February 2004
Location: North Plains, ORYGUN
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If it's gray, it's probably Polybulylene, brand name Qest. Compatible
with PEX, but if you use primarily chlorinated water, you should switch
to PEX when you have the opportunity. Polybutylene will freeze and thaw
with relative impunity, but chlorinated water gradually disolves the PB,
and leaves pinholes which leak. Not as much problem in a coach as a
house, but that's why it's no longer used.
The conical fittings are screwed on, like pipe fittings. Crimp fittings
similar to those used with PEX were also used. Some stores still have
special crimp fittings for use when connecting to PEX. The plastic and
Shark-bite slip on fittings are compatible with copper pipe, CPVC pipe,
Qest and PEX.
My whole house has been plumbed with PB (Qest) for over 15 years and no
problems, including the water line out by the barn which freezes and
thaws on an annual basis. It's turned off, so no unseen leak would cause
a problem, but it has water in it all the time. We have a spring, so no
chlorine to eat the plumbing.
The GMC is plumbed with PB, also, but, because it sometimes gets city
water in the system, I'm replacing it with PEX as other projects require
access to the plumbing.
RonC
On Mon, 09 Dec 2013 13:46:20 -0600 David Orders <dao@oarsllc.com> writes:
>
>
> I thought my coach had PEX as OEM plumbing, but now I'm not sure. It
> has plastic tubing with some sort of conical compression fitting
> that appears to be glued onto the tubing. As I'm doing some
> repairs/upgrades I'm curious as to:
>
> * What is the original system called
> * Is it compatible with PEX fittings
>
> --
> 1976 Royale "Twinkie II", 1978 Palm Beach with front end fire.
> Lynnwood WA - “What did you learn today? Did you learn how to
> believe, or did you learn how to think?"
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Ron & Linda Clark
1978 Eleganza II
North Plains, ORYGUN
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Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
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