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The Goodman 20171701 Drain Trap is a genuine OEM condensate management component for the GCH950453BXAD high-efficiency gas furnace. On 95% AFUE condensing furnaces, the drain trap collects acidic condensate from the secondary heat exchanger and maintains the pressure seal that keeps flue gases from escaping the drain line. A cracked, clogged, or missing trap leads to water leaks, pressure-switch faults, and no-heat lockouts.
The trap's internal geometry sets the water seal height that the furnace's pressure switch relies on. This genuine OEM trap matches Goodman's port layout and seal depth exactly, so the pressure switch reads correctly. Generic traps can throw off the seal and trigger intermittent pressure-switch faults that are hard to diagnose.
Moderate (2/5) — Disconnect the condensate lines, remove the old trap, prime the new trap with water to establish the seal, and reconnect. Plan for a few drips; keep a towel handy and confirm no leaks before restarting.