Model DA6 Rev E Pressure Loaded Back Pressure Regulator; 2" Line Size; Stainless Steel Body Carbon Steel Loading Chamber; Special Trim; NPT End Connections; Internal Sensing; Per SPQ Number 52314: Special 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Fluorocarbon Diaphragm, Fluorocarbon Static Seal, PTFE Cap Seal Fluorocarbon Energizer Dynamic Seal; Customer Supplied Loader & Solenoid; Spring Assisted Fail Open