MODEL "DA2" DIFFERENTIAL PRESSURE REDUCING REGULATOR (SERIES II)-PDRV BODY SIZE 1",STANDARD DIAPHRAGM CONSTRUCTION; DUCTILE IRON BODY & SPRING CHAMBER,1/8" PETCOCK VENT; SPECIAL TRIM MATERIALS; NPT END CONNECTION; 1-10 PSID RANGE SPRING; PER SPQ NUMBER 55381 P TRIM: 17-4PH SST TRIM WITH GF-TFE SEAT, 302SST DIAPHRAGM