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Thread: PCV transition

  1. #1
    Rancher
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    Default PCV transition

    What is the best way to transition from PVC to either a brass gate valve i.e. male PVC to female brass, or would it be better to use a brass/gal steel nipple and go from female PVC with SS hose clamps to the male brass/gal steel.

    Rancher

  2. #2
    Commercial Plumber markts30's Avatar
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    Don't think male metal into female plastic is legal in any code...
    That being said, I prefer to use half of a SCH80 PVC nipple into the female brass valve body then glue the PVC into a coupling and then to the pipe...
    The SCH80 nipples do not break as easily as the MIP fittings and other male plastic adapters I have used...
    If the connection has to be disassembled frequently you can use a union (or banded coupling if the application is not a high pressure one)...

  3. #3
    Licensed Grump GrumpyPlumber's Avatar
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    NEVER use plastic FIP adapters for metal MIP.
    However, male plastic into metal is fine.
    "The biggest regrets we have in life are the chances we never took."

  4. #4
    DIY scratch-pad engineer leejosepho's Avatar
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    Quote Originally Posted by GrumpyPlumber View Post
    NEVER use plastic FIP adapters for metal MIP.
    However, male plastic into metal is fine.
    That makes sense, and I can also see the advantage of using half of a nipple like Mark mentioned. However, I recently discovered that some of the CPVC fittings (such as slip x thread male adapters) at the local box store are labelled "cold water only". Do you know what that is about? It looks to me like that is just some kind of ploy for selling the more-expensive plastic/brass hybrid version.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    Default cold only

    Hot water will create massive expansion/contraction issues and then the all plastic adapter will leak at the threads.

  6. #6
    Master Plumber Redwood's Avatar
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    Is this PVC outside the house?

  7. #7
    Licensed Grump GrumpyPlumber's Avatar
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    Quote Originally Posted by leejosepho View Post
    That makes sense, and I can also see the advantage of using half of a nipple like Mark mentioned. However, I recently discovered that some of the CPVC fittings (such as slip x thread male adapters) at the local box store are labelled "cold water only". Do you know what that is about? It looks to me like that is just some kind of ploy for selling the more-expensive plastic/brass hybrid version.
    Trust me, you don't want to use those things on potable (cold also).
    The brass/CPVC are expensive, but the plastic will fail, saw it happen...not gonna happen to me.
    The threads are so mallable thats it's difficult to know when they're over-tightened/stripped.
    "The biggest regrets we have in life are the chances we never took."

  8. #8
    Rancher
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    Quote Originally Posted by Redwood View Post
    Is this PVC outside the house?
    Yes PVC is outside, it's the transition to the water line to the inside, which is now going to be PEX due to the copper failing. I'm going to use a brass gate valve this time due to bad experience with the plastic handles on the PVC ball valves breaking off (3' underground...).

    Rancher

  9. #9
    Rancher
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    So I guess the consensus is, Schedule 80 PVC (the Gray stuff, right?) into the brass, and cut off the other threaded end and couple to Schedule 40 PVC (the white stuff) using a coupling.

    Did i get this right?

    Rancher

  10. #10
    Licensed Grump GrumpyPlumber's Avatar
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    Sounds good, unless you can find a brass X CPVC adapter at your local supply..brass threads are best.
    "The biggest regrets we have in life are the chances we never took."

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