Model "DA1" Pressure Reducing Regulator (Series I); Body Size 1",Standard Diaphragm Construction; Cf3m Body, 316l SST Spring Chamber; 316l SST Trim, V-Tfe Seat, Be-Cu Diaphragm,;SST/Tfe U-Cup Static Seal, SST/Tfe U-Cup Dynamic Seal; Non-High Purity Tube End Connections; 20-80 PSIG Range Spring; Internal Sensing, Standard - Flow To Open Direction; Opt-55: Cleaned For Oxygen Service Per Spec #S-1134