1819 Milton Industries "G" Style 3/8" Male NPT Plug. 1/2” basic flow size, Maximum inlet pressure: 300 PSI, G-Style couplers are steel plated to resist rust, Maximum temperature: 250° F, G-Style plugs are case hardened steel, plated to resist rust, Air flow: 99 SCFM, Also known as “1/2" flow T-Style®", Seals: Buna-N