Model DA1 Rev E Pressure Reducing Regulator; 1" Line Size; Carbon Steel Body With Carbon Steel Spring Chamber; NP NACE Trim, Polyurethane Seat, Neoprene Diaphragm, PTFE Static Seal, Elgiloy/PTFE U-Cup Dynamic Seal; NPT End Connections; 200-450 PSIG Range Spring, OPT-80: High Outlet Pressure Construction; Internal Sensing; OPT-40: Construction Per NACE Standard MR0175