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The Goodman B9102097 Liquid Line Cap with O-Ring is the OEM sealing cap for the liquid line service port on the Goodman WPC4330AHAA packaged air conditioner. This small but critical fitting threads onto the service valve to provide a secondary, leak-tight seal that protects the refrigerant charge and keeps dirt and moisture out of the system. The included O-ring ensures a positive seal that the cap threads alone cannot guarantee.
The OEM Goodman B9102097 guarantees correct thread size and O-ring material rated for refrigerant service. A generic brass service cap may fit physically and cost less, but verify thread pitch and O-ring compatibility before relying on it as a refrigerant seal. For a leak-critical fitting, OEM is the low-cost, high-confidence choice.
Easy (1/5). Hand-thread the cap onto the service port and snug it down — no tools or refrigerant handling required for the cap itself. Replace a worn cap or missing O-ring any time you notice it during routine service.