Model "DA6" Dome Loaded Back Pressure Regulator (Series VI)-PLBPV; Body Size 3",Standard Diaphragm Construction; Ductile Iron Body & Loading Chamber; 17-4ph SST Trim, 316l SST Cage, Pa Seat, Bc Diaphragm;Nbr Static Seal, SST/Tfe U-Cup Dynamic Seal; 125 Lb Flat Face Flanges; Internal Sensing, Reverse - Flow To Open Direction;With Loading Configuration