Tape / dope on braided supply lines?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by DavidTu, Oct 1, 2011.

  1. DavidTu

    DavidTu Member

    Messages:
    239
    Location:
    Seattle, WA
    I thought I'd seen on the forum to NOT put pipe dope and/or plumbers tape on braided supply line connections... but now I don't find the reference. In any case... do these connections take dope or tape? My faucet instructions call for it but I've installed them w/o leaks and without tape or dope previously.

    What is best practice on this?
    Last edited by a moderator: Mar 14, 2014
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,890
    Location:
    NW Ontario, Canada
    Many of the braided hoses now have O-ring seals and as such don't need to be doped. If they use a metal to metal seal, a little pipe dope is fine but I would never use tape. IMHO tape is for sealing threads and on those hoses the threads don't do the sealing.
  3. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    If it's a compression fitting, you don't use tape or dope.

    The compression ring/ferrule seals the joint, over tightening is also bad news.

    Tape and dope are for TAPERED threads, where the threads do the sealing.
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Braided supply lines normally have a rubber gasket seal...tape would intefere. Some brands use a 'bullnose' which simulates an actual compression ring. It is for metal-to-metal seal, and again, NOT tape or dope
  5. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,890
    Location:
    NW Ontario, Canada
    THe problem with the bullnose is that it is of a much harder metal and so does not truly simulate a compression ring, which as the name implies, compresses to seal not only against the tube but also against the machined tapers. Any imperfection in the machined faces can cause a leak.

    Last edited by a moderator: Oct 2, 2011
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