Model "DA1" Pressure Reducing Regulator (Series I); Body Size 1",Standard Diaphragm Construction; Carbon Steel Body & Carbon Steel Spring Chamber; Nace Trim, Pa Seat, Fkm Diaphragm;Fkm Static Seal, Elg-Tfe U-Cup Dynamic Seal; Npt End Connection; 100-300 PSIG Range Spring; Internal Sensing, Standard - Flow To Open Direction; Opt-40: Nace Construction Per Spec# Mr0175; Opt-95: Epoxy Paint Per Spec #S-1547