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The Goodman B9102097 Liquid Line Cap with O-Ring is the genuine OEM service-port cap for WPC4336AHAA packaged air conditioners. It threads onto the liquid line service valve and, together with its captive O-ring, forms a leak-tight seal that protects the refrigerant charge between service visits. A worn, missing, or cross-threaded cap is one of the most common sources of slow refrigerant loss, so replacing it with the correct OEM part keeps your system holding charge and running efficiently.
The OEM cap ships with the factory-spec O-ring durometer and thread pitch, so it seats fully and holds pressure the first time. Generic caps are lower cost but frequently use a slightly mismatched O-ring that weeps under high-side pressure — fine for a temporary fix, less ideal for a sealed refrigerant circuit. For a part this inexpensive, OEM is the safe choice.
Easy (DIY-friendly). Hand-thread onto the service port and snug with a wrench — no refrigerant handling required for the cap itself. Always verify the system is not actively being serviced before removing the old cap.