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The Goodman 20171701 Condensate Drain Trap is the factory OEM part for the GMH950904CXAC 96% AFUE two-stage gas furnace and other Goodman/Amana high-efficiency models that produce condensate. The trap maintains the water seal that lets the drain system carry away flue condensate while preventing combustion gases and negative pressure from being pulled back into the burner enclosure. A cracked, clogged, or missing trap is a leading cause of nuisance pressure-switch lockouts and water pooling around the furnace base.
OEM vs. Generic: This is a genuine Goodman-spec trap engineered to the exact port spacing, seal depth, and inlet/outlet geometry of your furnace. Universal traps often require adapters and can throw false low-pressure faults if the water column height is wrong. The OEM part drops in without guesswork and preserves your warranty.
Install Difficulty: Easy (1/5). Power down the furnace, disconnect the inlet and drain hoses, swap the trap, reconnect, and prime with water. Typically a 10–15 minute job with no special tools.