Model B2, Back Pressure Regulator; 1/2" Size, Cv=0.30; 316L Stainless Steel Body, 316L Stainless Steel Spring Chamber; Inconel TFE Liner Diaphragm, Kalrez Seat, Monel R-405 With PCTFE Seal, Port Configuration A; FNPT End Connection; 3-250 PSIG Range Spring; No Inlet Gauge