MODEL "BQ" BACK PRESS RELIEF REGULATOR, TFE GASKETS 1/4" INLETS,1/2" OUTLET; SPECIAL BODY & SPRING CHAMBER MATERIAL; S36 TRIM: 316SST WITH TFE SEAT,302SST DIAPHRAGM; NPT SCREWED; 65-150 PSIG SST RANGE SPRING; PER SPQ NUMBER 56689 WITH DN8 INLETS, DN15 OUTLET; RANGE 65-150 PSIG (448-1034 KPAG), SET AT 80 PSIG (551 KPAG);SST CRYOGENIC CONSTRUCTION; CLEANED PER S-1542; CONSTRUCTED PER GARDNER CRYOGENICS DRAWING #6497A-1, REV. U; REQUIRES US COSTMARY TAGGING AND METRIC TAGGING;