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The Goodman 20171701 is a genuine OEM condensate drain trap engineered for the WGFM195070S4CAB 95% AFUE, 70,000 BTU high-efficiency gas furnace. In a condensing furnace, the drain trap captures acidic condensate produced by the secondary heat exchanger and maintains a water seal that blocks flue gases from escaping through the drain line. A cracked, clogged, or dried-out trap is one of the most common causes of pressure-switch lockouts and nuisance shutdowns, so a correct replacement restores reliable heating.
This is the factory OEM Goodman part, molded to the exact port spacing and barb sizing of your furnace so the existing hoses seat without adapters or leaks. Generic universal traps are cheaper but often require re-routing hoses and can leak at mismatched fittings — a real risk when the trap protects against flue-gas spillage. For a condensing furnace, OEM fit is strongly recommended.
Power down the furnace, disconnect the condensate hoses, unclip or unscrew the old trap, prime the new trap with water, and reconnect. Typically a 15–20 minute job with basic hand tools. Confirm the trap is filled before restarting to avoid a false pressure-switch trip.