Model DA1 Rev E Pressure Reducing Regulator; 3" Line Size; Sales Kit A; Stainless Steel Body WIth Ductile Iron Spring Chamber; P4 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, EPR Diaphragm, EPR Static Seal, EPR O-Ring Dynamic Seal;