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The Goodman B9102097 Liquid Line Cap with O-Ring is a genuine OEM service-port cap for the Goodman WPC4424AHAA air conditioner and compatible packaged units. This cap threads onto the liquid line service valve and, together with its captive O-ring, forms a secondary leak-tight seal that protects the Schrader core and prevents slow refrigerant loss. A missing, cracked, or O-ring-less cap is a common source of small leaks and contamination — replacing it keeps the sealed system tight and to code.
This genuine Goodman OEM cap is sized to the factory liquid-line valve thread and ships with the correct O-ring durometer for a reliable refrigerant-grade seal. Generic caps may use the wrong thread pitch or a non-rated O-ring, risking leaks. For a sealed-system component, the OEM part is the dependable choice.
Easy (1/3). Hand-thread the cap onto the service valve and snug it lightly — no tools or refrigerant work required to seat the cap. Inspect the O-ring before fitting and do not over-tighten.