Model "SAP" Do-All Pressure Loaded Reducing Regulator,; Body Size 1", Large Piston Construction; Bar Stock 316l SST Body & Cover Dome; 316L SST Plug & Cage, Polyall Seat; Fkm O-Ring Static Seal; Tfe U-Cup W/SST Energizer Dynamic Seal; Ffkm Body/Cover Dome Seal; Tube End Bw Connections; No Range Spring, Pressure Loaded; Internal Sensing, 2-5 PSIG Lower Spring; High Purity Electro Polish To 10ra Avg. Finish; Cleaned To Spec;#S-1662; Helium Leak Test Per Spec #S-1661