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The Goodman 20171701 Condensate Drain Trap is a genuine OEM assembly for the GKS91155DXAD 92% AFUE condensing gas furnace. On a high-efficiency furnace the flue gases cool enough to release water vapor as acidic condensate; this trap collects and drains that condensate while maintaining a water seal that keeps combustion/flue gases from escaping into the cabinet and stops the pressure switch from reading a false open.
A cracked, clogged, or improperly seated drain trap is one of the most common causes of condensing-furnace lockouts, pressure-switch faults, and water leaks. Replacing it with the correct OEM trap restores proper drainage and safe furnace operation.
OEM vs. Generic: The OEM trap is molded to match the furnace's drain-port locations, tubing sizes, and pressure-switch tap. Universal traps frequently misalign, leak, or fail to hold the correct water seal, triggering repeat service calls. For reliable operation, the exact OEM 20171701 is the right choice.
Install Difficulty: Moderate (3 of 5). Requires draining the old trap, disconnecting several tubes, and reseating the new assembly with correct routing to the pressure switch and drain. Shut off power before servicing. Prime the trap with water and verify no leaks or pressure-switch faults after restart.