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The Goodman A3468601 is a genuine 3/16" inner-diameter pressure switch tubing hose engineered for GMTH090-5A gas furnaces. This small but critical component carries the negative draft-pressure signal from the inducer housing to the pressure switch, allowing the control board to confirm safe venting before ignition. A cracked, brittle, or disconnected hose is one of the most common causes of a furnace that ignites briefly and then shuts down on a pressure-switch fault.
OEM vs. Generic: Our genuine Goodman tubing is molded from heat-rated silicone that resists the hardening and cracking that plagues cheap generic vinyl hose after a few heating seasons. Generic tubing may fit initially but tends to collapse or split under repeated thermal cycling, leading to nuisance lockouts. For a safety-related pressure signal, the OEM hose is the reliable choice.
Install difficulty: Easy (1/5). Slide the old hose off both barbed fittings, route the new tubing along the same path, and press it firmly onto each nipple. No tools required. Always verify the routing is free of kinks and clear of hot surfaces.