MODEL "DA1" PRESSURE REDUCING REGULATOR (SERIES I) BODY SIZE 1/2",STANDARD DIAPHRAGM CONSTRUCTION; CARBON STEEL BODY & CARBON STEEL SPRING CHAMBER; SPECIAL TRIM MATERIALS; 300 LB RAISED FACE FLANGES; 100-300 PSIG RANGE SPRING; PER SPQ NUMBER 55243 STANDARD DIAPHRAGM CONSTRUCTION; 316L SST TRIM, V-TFE SEAT, FKM DIAPHRAGM FKM STATIC SEAL, FKM DYNAMIC SEAL; INTERNAL SENSING, FLOW TO OPEN;