PEX Connections

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by countrylife, May 22, 2011.

  1. countrylife

    countrylife New Member

    Messages:
    3
    Location:
    Texas
    I have a PEX pipe coming out of my slab that has a black interior, a shiny metalic layer, then a gray outer layer. I'm assuming it's the aluminum oxygen barrier PEX. The outside diameter is .9375 (15/16") so the 3/4" crimp rings I get at Lowe's will not fit.

    Note: it appears that the outer layer of gray has been removed to put a fitting on originally. Experimenting with the pipe and removing the gray puts the metal layer at just over the .875" that is specified for 3/4" pipe. I can't believe that this is the right way to terminate the pipe.

    What kind of crimp rings are supposed to be used for this pipe?
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,686
    Location:
    Cave Creek, Arizona
    The fittings and crimp rings made FOR it. It is probably Pex-Al-Pex which was normally only used for infloor heating systems. Hopefully your brand is still in production, because some companies have abandoned the material.
  3. countrylife

    countrylife New Member

    Messages:
    3
    Location:
    Texas
    I talked to a couple of different plumbing houses today and found out that the pipe is Viega Pex. Also found out that as part of the fitting installation a "reamer" is used to reduce the outside diameter of the pipe. I don't know anything about Viega yet, but I'll read up on them.
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