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The Goodman A3468601 Pressure Switch Tubing is a genuine OEM 3/16" ID hose for the AMH80905CNAA 80% AFUE gas furnace. This small-diameter tube connects the inducer/collector box to the pressure switch, transmitting the vacuum signal that proves proper draft before the burners fire. Cracked, brittle, kinked, or condensate-blocked tubing causes false pressure-switch faults and ignition lockouts — a fresh OEM length restores accurate draft sensing and reliable starts.
OEM tubing is spec'd for the correct ID, wall thickness, and temperature rating so it seals tightly on the switch and inducer ports. Generic tubing can be the wrong bore or degrade quickly near the heat exchanger. For dependable draft proving, use the genuine Goodman tube.
Very Easy (1/5). Power down the furnace, slip the old tube off both barbed fittings, and press the new tube fully onto each port with no kinks. Under 10 minutes with no tools required.