Model DA4 Rev E Pressure Loaded Reducing Regulator; 2" Line Size; Stainless Steel Body With Carbon Steel Loading Chamber; PD 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, GF-TFE Seat, Fluorocarbon Diaphragm, Fluorocarbon Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; OPT-30: Mates With ASME 300 Raised Face Flanges; Lower Spring 4-10 PSIG Range; Internal Sensing