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The Goodman/Amana A3468601 is genuine OEM 3/16" inside-diameter pressure switch tubing for the AMS81155CNAA 80% AFUE gas furnace and compatible Goodman/Amana models. This flexible hose carries the negative pressure signal from the inducer or collector box to the pressure switch, proving that the vent path is open before the gas valve is allowed to fire. Cracked, brittle, kinked, or condensate-blocked tubing is a common cause of a furnace that clicks and locks out on an open pressure switch.
The OEM A3468601 uses the correct 3/16" bore and high-temperature material so it seals tightly on the switch and inducer barbs and resists heat aging near the burner compartment. Generic tubing can be the wrong bore or a lower temperature rating, leading to leaks or premature cracking and false pressure-switch faults. The OEM hose restores a reliable signal.
Power down the furnace, slide the old tubing off both barbs, route the new hose the same way, and press it fully onto each fitting — avoid sharp bends or low loops that trap condensate. Confirm the pressure switch closes and the burners fire normally after service.