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The OEM Goodman 20201802 is a pre-formed condensate drain hose/tube for the Amana/Goodman AMVC950704CXAE high-efficiency furnace. It routes acidic combustion condensate between the collector box, pressure-switch trap, and drain connections. Because it is molded to the correct length and bend, it maintains proper slope and avoids the kinks or sags that trap water and cause pressure-switch lockouts.
The genuine OEM 20201802 matches Goodman's barb diameters and factory bend radius, so it seats fully and holds slope without zip-tie gymnastics. Generic bulk tubing must be cut and coaxed to shape and can collapse at tight bends — restricting drainage and mimicking a bad pressure switch. At this price, OEM is the easy call.
Power down, pull the old hose off its barbs, and press the replacement fully onto each fitting. Confirm continuous downhill slope and no pinch points. Prime the trap with water afterward. Typically a 5-minute, no-tool job — perfect to replace alongside the drain trap during routine service.