Model DA5 Rev E Back Pressure Regulator; 1" Line Size; Ductile Iron Body With Ductile Iron Spring Chamber; PJ 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Epr Diaphragm, Epr Static Seal, Tfe Cap Seal W/Epr Energizer Dynamic Seal; OPT-31: BSPT Tapered Thread End Connections; 10-35 PSIG Range Spring; Internal Sensing