Model SLR-1 Pressure Reducing Regulator W/Self-Relieving Loader; Body Size 1",; Bronze Body & Loading Chamber; Monel M Trim, Pa Seat, Fk Diaphragm;Fk Static Seal, SST/Tfe U-Cup Dynamic Seal; Npt End Connection; No Lower Spring; Internal Sensing, Standard - Flow To Open Direction; 1/4" Size Npt, Loader, Brass Body & Spring Chamber, Self-Relieving,;SST Trim, Tfe Seat, Spring Range 5 - 500 PSIG; Brass Filter, Copper Tubing, Brass Fitting With Helix Coils; Opt-55: Cleaned For Oxygen Service Per Spec #S-1134; With Special Brass 0.060" Orifice Connected To The Dome;