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The Goodman 20171701 drain trap is a genuine OEM condensate trap for the Goodman GKS91155DXAA high-efficiency gas furnace. In 90%+ AFUE furnaces, combustion produces acidic condensate that must drain freely while the trap maintains a water seal against flue-gas leakage and false pressure-switch readings. A cracked, clogged, or brittle trap causes pressure-switch faults, water leaks, and furnace lockouts — one of the most common no-heat callbacks.
The trap's internal geometry and port spacing must match the furnace's drainage and pressure-switch tubing exactly. Genuine OEM traps bolt up with correct fittings and seal depth; generic or universal traps often require adapters and can create the very pressure faults you're trying to fix. OEM ensures a clean, leak-free installation.
Disconnect the condensate and pressure-switch tubing, remove the old trap, and mount the replacement with fresh clamps. Straightforward for a technician; flush and prime the trap with water before startup.