MODEL "DA1" PRESSURE REDUCING REGULATOR (SERIES I) BODY SIZE 2",STANDARD DIAPHRAGM CONSTRUCTION; BRONZE BODY & SPRING CHAMBER; T TRIM: 17-4PH SST/MONEL TRIM WITH POLYALL SEAT,FLUOROSILICONE(FK) DIAPHRAGM; FLUOROSILICONE(FK) STATIC SEALS,TFE U-CUP W/SST ENERGIZER DYNAMIC SEAL