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The Goodman 20171701 is the genuine OEM condensate drain trap for the GCH950904CXAA 95% high-efficiency gas furnace. In a condensing furnace, the secondary heat exchanger produces acidic condensate that must drain away while the trap's water seal blocks flue gases from escaping into the cabinet. A cracked, clogged, or brittle trap leads to standing water, a tripped pressure switch, condensate leaks onto the floor, and lockout faults. Replacing the trap restores proper drainage and keeps the induced-draft circuit sealed.
This OEM Goodman trap matches the factory port spacing, barb sizes, and float/seal geometry, so the pressure switch reads correctly and the gaskets seat without leaks. Generic traps frequently have mismatched inlet/outlet locations or looser tolerances that cause slow drips and nuisance pressure-switch faults. On a sealed-combustion appliance, a proper trap is a safety item, not just a plumbing part.
Plan for 30–45 minutes. Power down the furnace, disconnect the condensate lines and pressure-switch tubing, remove the old trap, and prime the new trap with water before reconnecting. Verify all barbed fittings are fully seated and check for drips on the first heating cycle. Flush the trap seasonally to prevent future clogs.