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Thread: shower remodel - old shower supply is PVC/replace with CPVC

  1. #1
    DIY Junior Member carrotguy's Avatar
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    Default shower remodel - old shower supply is PVC/replace with CPVC

    Hello all,

    I did a search earlier today and I think I checked all of the related threads, but I'm throwing this out here to be sure.

    I'm finishing up a shower remodel and I found that the current shower supply line is PVC, not CPVC. This is an older 3-handle price pfister manifold (where the hot, cold, and diverter valves screw in)...

    As an aside, this is a 2-bath house and the other shower supply line is apparently the original copper, but the one we're fixing now is PVC.

    There's a small leak at the manifold where the shower supply line connects. My goal is to remove the worn PVC line and install a new CPVC fitting and supply line.

    The original PVC was 1/2". I've already purchased 3/4" CPVC. The only thing I need to do now is buy the adapter that will connect the CPVC into the manifold.

    I've read that CPVC is more flexible... this is around a 5'-7' run of supply line I would guess. Is there anything that I might need to connect a CPVC shower supply line to the existing price pfister manifold other than one of those copper-to-CPVC adapters? I read something about specialty copper fittings required to go from different pipe diameters and I want to be sure I don't miss the chance to do the right thing.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default Cpvc

    This is an inside the wall connection and you are going to jury rig a line between the copper and the valve, and also "flex" it?

  3. #3
    DIY Junior Member carrotguy's Avatar
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    Default

    basically, i have to fix a shower supply line from a price pfister 3-handle manifold. the previous shower supply line was 1/2" PVC, and i wanted to replace it with 3/4" CPVC.

    i read a blurb about different expansion rates between copper and CPVC, and i thought that i would need a copper -> CPVC transition piece but i couldn't find what i needed at the orange box store last night.

    the problem i noticed last night is - when using CPVC, i couldn't find a 90 degree elbow that was threaded to accept the shower arm.

    i might have to use PVC. i know it doesn't handle hot water as well but the previous PVC supply line was in good enough shape.

  4. #4
    DIY Junior Member carrotguy's Avatar
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    Default

    to clarify though... i only mentioned flex as i read that CPVC needs a bit more support... there were three pipe fasteners there already but i figure with a ~5' run, those should suffice. it's going to be a straight run.

  5. #5
    DIY Member psolutions's Avatar
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    Default Plumbing Shower

    Are you talking about a cpvc shower ell that the shower arm screws into? Its a shower ell that screws to the backing board. You should be able to find this in cpvc and a cpvc/brass. I would get the cpvc/brass for stability.

    OR

    are you talking about the actual fittings to thread onto the valve in a 90 slip on one end and threaded on the other?
    Plumber in Columbia SC
    Plumbing Solutions LLC
    Residential Plumbing & Repair

  6. #6
    Master Plumber Redwood's Avatar
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    Default

    Personally I don't use CPVC But if I was threading stuff into and onto CPVC I would use fittings like this...




  7. #7
    Radon Contractor and Water Treatment 99k's Avatar
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    Default

    Quote Originally Posted by Redwood View Post
    Personally I don't use CPVC But if I was threading stuff into and onto CPVC I would use fittings like this...



    I think you are spot on redwood. You are a walking supply store

  8. #8
    Plunger/TurdPuncher kingsotall's Avatar
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    Default Sounds like a repipe is in order, too.

    If the potable water in the house is PVC then it might be in your best interest to look into a whole repipe of your house. I get shivers just thinking of those PVC pipes in your walls.

  9. #9
    In the Trades Gary Swart's Avatar
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    Default

    I just completed installation of a new tub/shower valve. The tub and shower were piped with CPVC using the connectors as Redwood pictured. They had preformed well for over 20 years, however I replaced everything with copper. I don't trust plastic pipe.

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