PVC to brass

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by DIY, Jun 26, 2008.

  1. DIY

    DIY New Member

    Messages:
    153
    Location:
    Florida
    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. leejosepho

    leejosepho DIY scratch-pad engineer

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

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,262
    Location:
    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.
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    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. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Avoid screwing metal male threads into a plastic female whenever possible.

    You are talking about the 1998 "B" movie starring Charlize Theron right? LOL
    http://images.google.com/imgres?imgurl=http://l.yimg.com/img.movies.yahoo.com/ymv/us/img/hv/photo/movie_pix/universal_pictures/k_pax/_group_photos/charlize_theron22.jpg&imgrefurl=http://movies.yahoo.com/movie/contributor/1800019484/photo/224628&h=400&w=280&sz=43&hl=en&start=14&tbnid=WbGDjgdMSb6VzM:&tbnh=124&tbnw=87&prev=/images%3Fq%3Dmighty%2Bjoe%2Byoung%26gbv%3D2%26hl%3Den%26safe%3Doff%26sa%3DG

    [​IMG]
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