Model DA1 Rev E Pressure Reducing Regulator; 1/2" Line Size; Sales Kit A; Carbon Steel Body With Carbon Steel Spring Chamber; P3 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, CTFE Seat, Neoprene Diaphragm, BUNA-N Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal