Model DA4 Rev E Pressure Loaded Reducing Regulator; 3" Line Size; Carbon Steel Body With Carbon Steel Loading Chamber; P8 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, GF-TFE Seat, Fluorosilicone Diaphragm, Fluorosilicone Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; OPT-30: Mates With PN16 Raised Face Flanges; No Lower Spring; Internal Sensing