MODEL "123" SALES B KIT FOR PRODUCT CODE: 8D5-AXX7-62X55870C; BACK PRESSURE RELIEF REGULATOR,TFE GASKETS (OPT-45) 3/4" SIZE; CF8M BODY & SPRING CHAMBER; SPECIAL TRIM MATERIAL; ; PER SPQ NUMBER 55870 PER SPQ: OPTION -9 TFE DIAPHRAGM COVER; OPT-55: CLEANED FOR OXYGEN SERVICE PER SPEC #S-1134