Model DA4 Rev E Pressure Loaded Reducing Regulator; 1-1/2" Line Size; Sales Kit A; Bronze Body With Bronze Loading Chamber; P2 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Neoprene Diaphragm, BUNA-N Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; OPT-56: Cleaned For Non-Oxygen Service Per Cashco Specification S-1542