Sizing of Shower Nipples

Discussion in 'Shower & Bathtub Forum & Blog' started by John F ATL, May 17, 2005.

  1. John F ATL

    John F ATL New Member

    May 17, 2005
    I am tring to change some plumbing fixtures in a shower with a finished wall. The fixture calls for a nipple recessed 3/8" behind the finished wall. My problem is that a 2" tube is too long and a 1 1/2" is too short. What are my options? Since the threads on the nipple are tapered, a wasn't sure if I could just trim some off.

    Thanks for your help,

  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    Pipe nipples come in 1/2" increments, not making life easy.

    There is a certain amount of "play" as far as how tight or loose you can tighten these things.
    You can also use more thread sealant or less.
    Sometimes the valve in the wall can be moved.

    In some cases, there is a flange that will slide back and forth too.
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  4. Dave Meers

    Dave Meers New Member

    Jan 29, 2005
    You could take a short piece of half inch copper and sweat a threaded adapter on each end to make the nipple the exact length you need. I've done that on tub spouts before and it should work for a shower nipple as well.
  5. John F ATL

    John F ATL New Member

    May 17, 2005
    I figured it out

    I thought of what you guys had suggested, but with the wall finished and a very expensive fixture and was a little hesitant about tightening too much. I used two 1/2" to 3/8" fittings with a close 3/8" nipple, tightened as tight as I could with two crescent wrenches. It was exactly 1 3/4", all for about $5.00. I hope this helps someone else.
  6. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    Depending on what the nipple was connecting, that 3/8xclose nipple could induce back pressure.
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