MODEL "DA1" PRESSURE REDUCING REGULATOR (SERIES I) BODY SIZE 1",STANDARD DIAPHRAGM CONSTRUCTION; CARBON STEEL BODY & CARBON STEEL SPRING CHAMBER; 17-4PH SST TRIM, 316L SST CAGE, PA SEAT, NBR DIAPHRAGM, NBR STATIC SEAL, O-RING DYNAMIC SEAL; SPECIAL END CONNECTION; 20-80 PSIG RANGE SPRING; PER SPQ NUMBER 55773 PER SPQ: SPECIAL 300# RF END CONNECTION WITH 14.00" FACE TO FACE; INTERNAL SENSING, STANDARD - FLOW TO OPEN DIRECTION;