Model DL Rev B Pressure Reducing Regulator, OPT-45: Cryogenic Construction; 2" Line Size; Stainless Steel Body And Spring Chamber; S36 Trim: 316 Stainless Steel With PTFE Seat, 302 Stainless Steel Diaphragm; NPT Threaded End Connections; 70-150 PSIG Range Spring; OPT-25S: Stainless Steel Spring Chamber Vented Plug; OPT-55: Cleaned For Oxygen Service Per Cashco Specification S-1134; With Special Bolting To Meet -425°F Temperature Rating