Model B2, Back Pressure Regulator; 1/4" Size, Cv=0.30; Brass Body, 6061 Aluminum Spring Chamber; 302 Stainless Steel With Tefzel Ring Diaphragm, TFE Seat, 316L Stainless Steel With PCTFE Seal, Port Configuration A; FNPT End Connection; 2-50 PSIG Range Spring; No Inlet Gauge; Panel Mount