Model "DA1" Pressure Reducing Regulator (Series I); Body Size 1-1/2",Standard Diaphragm Construction; Bronze Body & Spring Chamber; Monel M Trim, V-Tfe Seat, Fk Diaphragm,;Fk Static Seal, SST/Tfe U-Cup Dynamic Seal; Npt End Connection; 1-10 PSIG Range Spring; Internal Sensing, Standard - Flow To Open Direction; Opt-55: Cleaned For Oxygen Service Per Spec #S-1134