Model DA4 Rev E Pressure Loaded Reducing Regulator; 2" Line Size; Sales Kit A; Stainless Steel Body With Stainless Steel Loading Chamber; P9 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, PTFE Seat, Fluorosilicone Diaphragm, Fluorosilicone Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal