I want to install new shutoff valves in a bathroom I am finishing. My water supply lines are PVC. Can I use a standard shutoff valve with a brass compression ring and coupling nut?

Author: jfhonig


I want to install new shutoff valves in a bathroom I am finishing. My water supply lines are PVC. Can I use a standard shutoff valve with a brass compression ring and coupling nut?

PVC on domestic water supply Hummmmm

rots of luck may I ask Who did this to you?

PVC or do you mean CPVC?

While you have the walls off, why not run copper supply pipes? PVC should not be used for supply lines.

If you have PVC, you won't find a compression stop that will fit. But that is the least of your troubles....
If you have Flowguard Gold CPVC, they okay installation of compression fittings on their CPVC piping.
Deb
The Pipewench

To Deb (the pipe wench)
Thanks, my supply lines are Flowguard Gold CPVC.

If it is really PVC and not CPVC, then the answer is no because you will not find any that have compression connections for your size tubing. If it is really CPVC, i.e., 5/8" o.d., then many plumbers do use the conventional stops and compression rings.

Wouldn't the brass ferrel cut into the plastic pipe. They make cpvc glue on stops specifically for that.

It does but they seem to be able to "get away" with it without damaging the CPVC. Those that do not use the compression valves seem to favor the "push on" ones with the push/pull knob to operate it.

"Those that do not use the compression valves seem to favor the "push on" ones with the push/pull knob to operate it."

UGH

I have to say that it made me nervous the first time I used a regular compression stop on CPVC. But I figured that if Flowguard Gold okay'd it in their installation standards, that it had to be okay (imagine the lawsuits otherwise). I had had trouble with the stops made specifically for CPVC leaking and they seem rather cumbersome. I don't run alot of CPVC (I prefer Pex for acidic water conditions), but now use regular compression stops.
Deb
The Pipewench

I encourage you to go to the Flowguard web site and read all their installation standards. The more informed you are, the less likely you are to run into "surprises" :-(
Deb
The Pipewench

Well, if you are going to use CPVC you must be trying to save every penny you can on the job.

wow you guys really bash cpvc..we've had it in our house for 27 years with 0 leaks, 0 cracks, 0 problems PERIOD.

Well, some people have had polybutylene for 15 years or more without a problem. All that shows is for that particular installation the odds do not apply.

15....27...hmmmm..you do the math