Model DA6 Rev E Pressure Loaded Back Pressure Regulator; 1/2" Line Size; Stainless Steel Body With Stainless Steel Loading Chamber; ME Monel M Trim, PTFE Seat, FEP Laminated Fluorocarbon Diaphragm Diaphragm, Stainless Steel/PTFE U-Cup Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; NPT End Connections; External Sensing; OPT-55: Cleaned For Oxygen Service Per Cashco Specification S-1134