Used on 4330-01-472-6835 filter ay,high pressure and 4310-01-465-1507 compressor,reciprocating. skt quick disconnect socket end 1/4 inch npt, 3/16 with a viton seal clean iaw mil-std-1622 diver's air or equivalent navsea approved procedure clean iaw mil-std-1622 diver's air or equivalent navsea approved procedure for life support air system