Model B2, Back Pressure Regulator; 3/8" Size, Cv=0.30; 316L Stainless Steel Body, 316L Stainless Steel Spring Chamber; 302 Stainless Steel With Tefzel Ring Diaphragm, Viton Seat, 316L Stainless Steel With PCTFE Seal, Port Configuration D; FNPT End Connection; 10-750 PSIG Range Spring; No Inlet Gauge; Mounting Bracket; Red Knob