Model DA5 Rev E Back Pressure Regulator; 1/2" Line Size; Stainless Steel Body With Stainless Steel Spring Chamber; NF NACE Trim, Fluorocarbon Seat, Fluorocarbon Diaphragm, Fluorocarbon Static Seal, Elgiloy/PTFE U-Cup Dynamic Seal; OPT-30: Mates With ASME 150 Raised Face Flanges; 20-80 PSIG Range Spring; Internal Sensing; OPT-9: PTFE Diaphragm Cover, 0.020"