Model DA1 Rev E Pressure Reducing Regulator; 4" Line Size; Sales Kit A; Stainless Steel Body With Stainless Steel Spring Chamber; PJ 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, EPR Diaphragm, EPR Static Seal, PTFE Cap With EPR Energizer And GF-TFE Wiper Dynamic Seal; OPT-56: Cleaned For Non-Oxygen Service Per Cashco Specification S-1542