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  1. #1
    Join Date
    Apr 2003
    Location
    pittsburgh
    Posts
    15
    im tapping radiators to install 1/8 npt air vents. i do not know what size drill to use with a 1/8 npt tap.any help is greatly appreciated.

  2. #2
    Join Date
    Aug 2002
    Location
    manitowoc wisconsin
    Posts
    4,943
    11/32"
    Take your time & do it right!

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