MODEL "DA1" PRESSURE REDUCING REGULATOR (SERIES I) BODY SIZE 1",STANDARD DIAPHRAGM CONSTRUCTION; CARBON STEEL BODY & CARBON STEEL SPRING CHAMBER; NACE TRIM, PA SEAT, NBR DIAPHRAGM NBR STATIC SEAL, ELG/TFE U-CUP DYNAMIC SEAL; 300 LB RAISED FACE FLANGES; 30-150 PSIG RANGE SPRING; INTERNAL SENSING, STANDARD - FLOW TO OPEN DIRECTION; OPT-40: NACE CONSTRUCTION PER SPEC# MR0175;