MODEL "BQ" BACK PRESS RELIEF REGULATOR, TFE GASKETS 1/2" INLETS,1/2" OUTLET; CF8M BODY & SPRING CHAMBER (OPT-36), CRYOGENIC CONSTRUCTION OPT-55: CLEANED FOR OXYGEN SERVICE PER SPEC #S-1134; S36 TRIM: 316SST WITH TFE SEAT,302SST DIAPHRAGM; NPT SCREWED; 10-25 PSIG SST RANGE SPRING; PER SPQ/MA DRAWING NUMBER 32948 CONSTRUCTED PER LINDE PN 2065142;