Model DA4 Rev E Pressure Loaded Reducing Regulator; 4" Line Size; Sales Kit A; Carbon Steel Body With Ductile Iron Loading Chamber; P2 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Neoprene Diaphragm, BUNA-N Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal;