1/4 Inch Diamond U Series Coupler Plug x 1/4 Inch Male NPT These plugs are interchangeable with the Diamond-U standard series plugs produced by other manufacturers. Maximum operating pressure 300 PSI.
. Maximum operating pressure 300 PSI.1/4 Inch Industrial Steel Coupler Plug x 3/8 Inch Female NPT, PK 50 These plugs are interchangeable with the industrial (Hansen or Milton type) standard series plugs produced by other manufacturers.