. Interstate Pneumatics 3/8" Industrial Steel Coupler Plug x 1/2" Male NPT series plugs are forged from tool steel, heat treated and zinc plated to increase hardness, durability and corrosion resistance.3/8 Inch Industrial Steel Coupler Plug x 1/2 Inch Male NPT Maximum operating pressure 300 PSI.
Interstate Pneumatics 1/4 Inch Industrial Brass Coupler x 1/4 Inch Female NPT..Brass Industrial Coupler, 6 PK These couplers are interchangeable with the Industrial (Hansen or Milton) Standard series couplers produced by other manufacturers.