Model "ALR-1" Pressure Reducing Regulator W/Unloader For Remote Loading; Body Size 3",; Bronze Body & Loading Chamber; 17-4ph SST Trim, 316l SST Cage, Pa Seat, Fkm Diaphragm;Fkm Static Seal, O-Ring Dynamic Seal; 150 Lb Flat Face Flanges; No Lower Spring; Internal Sensing, Standard - Flow To Open Direction; With Unloader, 1/4" Size Npt, Bronze Body & Spring Chamber,;S2 Trim, SST Metal Seat And Diaphragm, Spring Range 100 - 175 PSIG; Brass Filter, Brass Fitting; Opt-55: Cleaned For Oxygen Service Per Spec #S-1134