Model DA4 Rev E Pressure Loaded Reducing Regulator; 1-1/2" Line Size; Sales Kit A; Stainless Steel Body With Stainless Steel Loading Chamber; SN 316L Stainless Steel Trim, PTFE Seat, Beryllium Copper Diaphragm, Stainless Steel/PTFE U-Cup Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; OPT-55: Cleaned For Oxygen Service Per Cashco Specification S-1134