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The Goodman 20171701 is a genuine OEM condensate drain trap for the GKS90904CXAC high-efficiency (90%+ AFUE) gas furnace and compatible Goodman/Amana models. In condensing furnaces, combustion produces acidic condensate that must drain away safely; this trap collects and routes that condensate while maintaining a water seal that blocks flue gases from escaping into the cabinet and tripping the pressure switch.
The trap's port configuration and internal seal are specific to Goodman's condensate layout. A genuine part ensures correct fit to the inducer and drain lines, while ill-fitting universal traps cause leaks, blocked drains, and recurring pressure-switch lockouts. OEM keeps the water seal reliable.
Moderate. Shut off power, disconnect the condensate and vent tubing, remove the old trap, and fit the replacement — then prime it with water to establish the seal. Clean any sludge from connected lines. Routine on high-efficiency furnaces; straightforward for a handy DIYer.