Model DA4 Rev E Pressure Loaded Reducing Regulator; 2" Line Size; Sales Kit A; Stainless Steel Body With Stainless Steel Loading Chamber; TN 17-4PH Stainless Steel Trim WIth Monel Cage, PTFE Seat, Beryllium Copper Diaphragm, Stainless Steel/PTFE U-Cup, Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; NPT End Connections; OPT-56: Cleaned For Non-Oxygen Service Per Cashco Specification S-1542