Model "P4", Balanced Trim, Single Stage Pressure Reducing Regulator; 1/2" Size, Cv'=.60; 316l SST Body, 316l SST Spring Chamber; 302 SST W/Tefzel Ring Diaphragm,Pctfe Seat,316l SST Seat;Retainer,316l SST Poppet,Inconel X-750 Poppet Spring,Viton/Tfe Back-Up;Ring,Port Configuration "F"; Fnpt End Connection; 2-100 PSIG Range Spring; 0-100 PSIG Outlet Gauge; 0-600 PSIG Inlet Gauge