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The Goodman A3468601 is a genuine OEM 3/16" inner-diameter pressure switch tubing designed for the Goodman/Amana AMH81155CNAA gas furnace and compatible models. This flexible hose carries the negative-pressure signal from the inducer housing or collector box to the furnace pressure switch, allowing the control board to confirm proper venting and combustion airflow before the burners are allowed to fire.
Over time, factory tubing can crack, harden, kink, or collapse from years of heat cycling, which produces nuisance lockouts, ignition failures, or a furnace that runs the inducer but never lights. Replacing the tube with the correct OEM part restores an accurate pressure signal and reliable ignition.
OEM vs. Generic: Generic bulk tubing may match the diameter but often uses a lower temperature rating and looser wall tolerances, which can lead to premature hardening near the hot inducer and intermittent pressure faults. This genuine Goodman tube is spec'd for furnace-side heat and delivers a leak-free connection that seals correctly to the barbed fittings the first time.
Install difficulty: Easy (DIY-friendly). Shut off power and gas, pull the old tube from both barbs, route the new length the same way, and press it fully onto each fitting. Typical replacement takes under 10 minutes with no tools. Always verify correct furnace operation after service.