Model SLR-2 Rev A Pressure Reducing Regulator With Non-Relieving Loader; 1-1/2" Line Size; Sales Kit A; Carbon Steel Body, Ductile Iron Loading Chamber; P1 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Neoprene Diaphragm, BUNA-N Static Seal, BUNA-N O-Ring Dynamic Seal; OPT-56: Cleaned For Non-Oxygen Service Per Cashco Specification S-1542