Model SLR-1 Pressure Reducing Regulator W/Self-Relieving Loader; Body Size 2-1/2",; Ductile Iron Body & Loading Chamber; 17-4ph SST Trim, 316l SST Cage, Pa Seat, Bc Diaphragm;Nbr Static Seal, SST/Tfe U-Cup Dynamic Seal; 125 Lb Flat Face Flanges; Lower Spring 2-5 PSIG Range; External Sensing, Standard - Flow To Open Direction; 1/4" Size Npt, Loader, Aluminum Body & Spring Chamber, Self-Relieving,;SST And Brass Internals W Buna-N Seat And Diaphragm;Spring Range 1 - 60 PSIG; Brass Filter, Copper Tubing, Brass Fitting; Opt-56: Special Cleaning Per Spec #S-1542