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The Goodman 20171701 Drain Trap is a genuine OEM condensate trap for the GMH950904CXAG 96% AFUE high-efficiency gas furnace. On condensing furnaces, the trap collects acidic condensate from the secondary heat exchanger and inducer while maintaining a water seal that blocks flue gases from escaping into the drain line. A cracked, clogged, or missing trap causes water leaks, pressure-switch faults, and safety lockouts — so a correct replacement keeps the furnace draining and cycling properly.
Port spacing, float/anti-siphon design, and connection sizes are model-specific. The OEM 20171701 drops in without adapters and seals correctly. Generic traps frequently require rework and can leak or trip the pressure switch. OEM is the reliable choice for condensate components.
Power down the furnace, disconnect the drain hoses, remove the old trap, install and prime the new 20171701 with water, then reconnect and check for leaks. Usually 15–25 minutes.
Confirm the part number before ordering. Questions? Contact info@nationalhvacparts.com.