Model DA1 Rev E Pressure Reducing Regulator; 3/4" Line Size; Carbon Steel Body With Carbon Steel Spring Chamber; NV NACE Trim, PTFE Seat, Neoprene Diaphragm, PTFE Static Seal, Elgiloy/PTFE U-Cup Dynamic Seal; OPT-30: Mates With ASME 300 Raised Face Flanges; 200-450 PSIG Range Spring, OPT-80: High Outlet Pressure Construction; Internal Sensing