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The Goodman 20171701 Drain Trap is a genuine OEM condensate trap for the WGFM195090S4CAC high-efficiency gas furnace. In a 95% AFUE furnace, combustion produces acidic condensate that must drain away safely; the trap holds a water seal that lets condensate flow out while blocking flue gases from being pulled back into the cabinet. A cracked, clogged, or missing trap causes pressure-switch faults, water leaks, and nuisance lockouts.
OEM vs. Generic: The genuine 20171701 is molded to the exact port layout and internal geometry this furnace requires, so ports align and the water seal depth is correct. Generic traps frequently leak at mismatched fittings or fail to hold the proper seal, leading to repeat pressure-switch trips. The OEM trap is the reliable long-term fix.
Installation difficulty: Easy to moderate (DIY-friendly). Power and gas off, disconnect the condensate hoses, swap the trap, prime it with clean water, and confirm all hose connections are tight and leak-free. Flush the trap seasonally to prevent buildup. Verify port configuration against your model diagram before ordering.