Model DA4 Rev E Pressure Loaded Reducing Regulator; 4" Line Size; Sales Kit A; Stainless Steel Body With Stainless Steel Loading Chamber; PK 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Fluorosilicone Diaphragm, Fluorosilicone Static Seal, PTFE Cap With Fluorosilicone Energizer And GF-TFE Wiper Dynamic Seal