Model DA2 Rev E Differential Pressure Reducing Regulator; 2" Line Size; Sales Kit A; Bronze Body With Bronze Spring Chamber, 1/8" Petcock Vent; M7 Monel 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