Model DA1 Rev E Pressure Reducing Regulator; 1/2" Line Size; Bronze Body With Bronze Spring 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; NPT End Connections; 5-20 PSIG Range Spring; Internal Sensing; OPT-5 Or OPT-36: Cryogenic Construction; OPT-56: Cleaned For Non-Oxygen Service Per Cashco Specification S-1542