Model "B2", Back Pressure Regulator; 1/4" Size, Cv'=0.05; 316l SST Body, 316l SST Spring Chamber; 302 SST W/Tefzel Ring Diaphragm, Tfe Seat, 316l SST W/Pctfe Seal, Port;Configuration "V"; Fnpt End Connection; 2-50 PSIG Range Spring; 0-60 PSIG (0-4.1 BARG) Inlet Gauge