MODEL "DA2" DIFFERENTIAL PRESSURE REDUCING REGULATOR (SERIES II)-PDRV BODY SIZE 1",OPT-81: FULL DIAPHRAGM SUPPORT CONSTRUCTION; CF3M BODY,316L SST SPRING CHAMBER,1/8" PETCOCK VENT; 17-4PH SST TRIM, 316L SST CAGE, V-TFE SEAT, FK DIAPHRAGM, FK STATIC SEAL, SST/TFE U-CUP DYNAMIC SEAL; 600 LB RAISED FACE FLANGES; 1-10 PSID RANGE SPRING; INTERNAL SENSING, STANDARD - FLOW TO OPEN DIRECTION; OPT-65A: DOUBLE TAPPED SPRING CHAMBER,1/4" NPT;