Model DA1 Rev E Pressure Reducing Regulator; 4" Line Size; Sales Kit A; Ductile Iron Body With Ductile Iron Spring Chamber; P1 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Neoprene Diaphragm, BUNA-N Static Seal, Neoprene O-Ring Dynamic Seal;