Model DA4 Rev E Pressure Loaded Reducing Regulator; 1/2" Line Size; Sales Kit A; Ductile Iron Body With Ductile Iron Loading Chamber; PF 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, GF-TFE Seat, Gylon 3-Ply Diaphragm, RTFE Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal