Model DA4 Rev E Pressure Loaded Reducing Regulator; 1" Line Size; Sales Kit A; Bronze Body With Bronze Loading Chamber; TH 17-4PH Stainless Steel Trim WIth Monel Cage, Polyurethane Seat, BUNA-N Diaphragm, BUNA-N Static Seal, PTFE Cap With BUNA-N Energizer And GF-TFE Wiper Dynamic Seal; OPT-55: Cleaned For Oxygen Service Per Cashco Specification S-1134