Model "DA1" Pressure Reducing Regulator (Series I); Body Size 1/2",Standard Diaphragm Construction; Cf3m Body, 316l SST Spring Chamber; 316l SST Trim, V-Tfe Seat, Fk Diaphragm,;Fk Static Seal, SST/Tfe U-Cup Dynamic Seal; Non-High Purity Tube End Connections; 30-150 PSIG Range Spring; Internal Sensing, Standard - Flow To Open Direction; Opt-9: Tfe Diaphragm Cover,0.020"; Opt-25s: Screen For Spring Chamber Vent; Opt-55: Cleaned For Oxygen Service Per Spec #S-1134