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Thread: PVC to brass

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  1. #1
    DIY Senior Member DIY's Avatar
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    Dec 2006

    Default PVC to brass

    Without starting a great debate as i've seen on here before ,and just recently regarding a similar subject. Threading a PVC female coupling onto a male brass fitting? Teflon tape,pipe dope,both, or nothing?

    Thanks all

  2. #2
    DIY scratch-pad engineer leejosepho's Avatar
    Join Date
    Nov 2006
    200 miles south of Little Rock


    I use about three wraps of teflon tape to do that.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Reliability is much better if you can configure it to use a male pvc fitting into a female brass one. WHen you tighten the two together, the brass can handle the squeeze, the plastic in the female fitting just expands and could eventually split. SO, don't overdo it and change if you can to put a male into brass.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    San Diego


    There is great danger of overtightening plastic to metal, and female plastic fittings are prone to crack if overtightened.

    My theory is that too tape makes the male too fat, and can cause problems. SO, two wraps of thin white tape, or one wrap of yellow tape. Brush on a thin coat of Great White dope.

    The PPFA recommends this procedure : Hand tight, then 1/2 turn by wrench. If necessary to stop a drip, additional 1/2 turn.

    Because plastic is soft, and the tape and/or dope is a lubricant, it is VERY easy to overtighten plastic to metal, distorting the plastic threads and causing a leak.

    If you are a person who has hands like Mighty Joe Young, then just hand tight often is enough. For most of us, the 1/2 wrench turn will finish the job.

    And as I have said before, if you are old enough to actually remember Mighty Joe Young, sit down and turn this job over to a youngster!!!

  5. #5
    Master Plumber Redwood's Avatar
    Join Date
    Dec 2007


    Avoid screwing metal male threads into a plastic female whenever possible.

    Quote Originally Posted by jimbo View Post
    And as I have said before, if you are old enough to actually remember Mighty Joe Young, sit down and turn this job over to a youngster!!!
    You are talking about the 1998 "B" movie starring Charlize Theron right? LOL


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