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The Goodman 20171701 Drain Trap is a genuine OEM condensate trap engineered for the Goodman GKS90453BXAC high-efficiency (90%+) gas furnace and compatible GKS90-series models. On a condensing furnace, the drain trap safely routes acidic condensate away from the secondary heat exchanger and inducer while maintaining a water seal that blocks flue gases from escaping into the cabinet. A cracked, clogged, or missing trap causes water leaks, pressure-switch faults, and lockouts.
The OEM trap matches the exact port configuration, inlet/outlet sizing, and mounting orientation Goodman designed for this furnace — ensuring proper drainage and a reliable pressure-switch signal. A Generic trap rarely matches the multi-port geometry of a condensing furnace, so OEM is the recommended choice here.
Moderate (3/5). Disconnect the condensate lines and pressure-switch tubing, swap the trap, and prime it with water before restart. Route tubing without kinks and verify free drainage to avoid nuisance lockouts.