1B4-2B57-1XX56946A

MODEL "BQ" BACK PRESSURE RELIEF REGULATOR,GRAPHITE/NBR GASKETS 1/2" INLETS,1/2" OUTLET; BRONZE BODY,DUCTILE IRON SPRING CHAMBER; B5 TRIM: BRASS WITH TFE SEAT,PHOS.BRONZE DIAPHRAGM; NPT SCREWED; SPECIAL RANGE SPRING; PER SPQ 56946 WTH 1/4" SPRING CHAMBER TAP; BASED OFF OF SPQ/MA DRAWING NUMBER 32966 SPECIAL 250-350 PSIG RANGE SPRING; FOR LIQUID CARBONIC CORP