Model DA5 Rev E Back Pressure Regulator; 1/2" Line Size; Sales Kit A; Stainless Steel Body With Stainless Steel Spring Chamber; P8 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, GF-PTFE Seat, Fluorosilicone Diaphragm, Fluorosilicone Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal