Model DA1 Rev E Pressure Reducing Regulator; 2" Line Size; Stainless Steel Body With Stainless Steel Spring Chamber; M9 Monel Trim, PTFE Seat, Fluorosilicone Diaphragm, Fluorosilicone Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; OPT-30: Mates With ASME 150 Raised Face Flanges; 10-30 PSIG Range Spring; Internal Sensing; OPT-55: Cleaned For Oxygen Service Per Cashco Specification S-1134