Model DA4 Rev E Pressure Loaded Reducing Regulator; 3" Line Size; Sales Kit A; Bronze Body With Bronze Loading Chamber; M7 Monel M Trim, Polyurethane Seat, Fluorosilicone Diaphragm, Fluorosilicone Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; OPT-55: Cleaned For Oxygen Service Per Cashco Specification S-1134