Model B2, Back Pressure Regulator; 1/4" Size, Cv=0.05; 316L Stainless Steel Body, 316L Stainless Steel Spring Chamber; 302 Stainless Steel With Tefzel Ring Diaphragm, TFE Seat, 316L Stainless Steel With PCTFE Seal, Port Configuration A; FNPT End Connection; 5-500 PSIG Range Spring; No Inlet Gauge