how tight to tighten a 1in union

Discussion in 'HVAC Heating & Cooling' started by rrekih, Nov 29, 2009.

  1. rrekih

    rrekih New Member

    Messages:
    46
    Location:
    Canada
    How tight should a 1in copper union be tightened?
    I have 2 that I have tried to tighten to no avail.
    Still very small leak under air pressure test of 40psi.
    I did sweat a threaded adapter to the union.
    The seal looks clean but dis-colored.
    Is there a way to lap the two matting surface's together?
  2. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    Why 2 threads with the same question?
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