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    WearyHandyman's Avatar
    WearyHandyman Posts: 1, Reputation: 1
    New Member

    Oct 21, 2008, 01:23 PM
    Connecting PVC P-Trap to Metal Waste Pipe
    I am replacing the drain in the bathroom lavatory. Is it OK to connect PVC to the existing metal pipe in the wall?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,818, Reputation: 1211
    Senior Plumbing Expert

    Oct 21, 2008, 05:33 PM
    Hey WH...

    If you are talking about threading a pvc adapter to say a threaded metal fitting in the wall... then yes... absolutely!

    If you are talking about connecting to an older pipe using a flexible clamp... then yes... as long as you use the right clamp (ask about this if planning to use this alternative).

    If you are talking about soldering a threaded fitting onto older copper pipe and then connecting a pvc adapter to that... then yes... for sure!

    Describe the metal pipe you have.. silver... copper? A picture would also help?

    Let us know...

    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,191, Reputation: 523
    Plumbing Expert

    Oct 21, 2008, 10:46 PM

    If you are ".....replacing...." drain, than you should already have threaded female T in the metal pipe. Use plastic male adapter, wrap threads with teflon tape and screw it in. Continue with plastic. Just like Mark said, yes, it is perfectly OK...
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber

    Oct 22, 2008, 06:22 AM
    Quote Originally Posted by WearyHandyman View Post
    I am replacing the drain in the bathroom lavatory. Is it ok to connect PVC to the existing metal pipe in the wall?
    Solder on a 1 1/2" copper slip to FIP(female ironpipe thread) to the wall stub out. Now you may transition to PVC using a PVC slip to MIP (male iron pipe thread) with a 1 1/2 to1 1/4" nylon gasket. See image below. Don't forget to wrap three turns of Teflon Tape around the male threads. Good luck, Tom

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