Model DA1 Rev E Pressure Reducing Regulator; 3/4" Line Size; Bronze Body With Bronze Spring Chamber; M7 Monel Trim, Polyurethane Seat, Fluorosilicone Diaphragm, Fluorosilicone Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; NPT End Connections; 20-80 PSIG Range Spring; Internal Sensing; OPT-55: Cleaned For Oxygen Service Per Cashco Specification S-1134