a waste a beautiful threads -> galvanized to pvc

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by vanhoudn, Aug 13, 2009.

  1. vanhoudn

    vanhoudn New Member

    Jun 17, 2009
    Pittsburgh, PA

    So I read on this thread:


    that you shouldn't attach male copper to female pvc.

    Does the same apply to galvanized? I'm doing a kitchen remodel and was lucky enough to find a galvanized vent pipe right where I wanted to put the sink. Can I just screw some pvc onto this vent so that I don't have to use an automatic vent?

    Or should I use a fernco (sp?) to make the transition? It just seems like a waste of beautiful threads.


  2. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego
    The caution about female plastic threads is that the fitting is so vulnerable to stress cracking from overtightening. But then, male plastic threads can also leak from deformation caused by over tightening.

    Female fittings are made, and are used. Just be careful.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    The problem with using ANY metal into a female plastic adapter is that ANY corrosion, no matter how slight will create enormous pressure and WILL crack the fitting. For that reason galvanized is even worse than brass, but for your purpose, a No-Hub or transition coupling, not the "generic" Fernco, is what you want to use.
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