Tridelta Furnace Vacuum Air Pressure Switch FS6075-640 Honeywell Carrier Bryant. This pressure switch was removed from a working furnace that was decommissioned for upgrading. Specific furnaces ive recovered this part from. ICP m/n: GUA080A012BIN. ICP m/n: GUA100A016DIN. ICP mfg #: GUA100AGDIN. Please excuse all dust and dirt from prior use. In order to offer you the most competitive price possible, no effort has been made to clean this part whatsoever.