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The Goodman B9102097 is a genuine OEM liquid line service cap supplied with its sealing O-ring for the WGHP4660ABA air conditioner / heat pump and compatible Goodman, Amana, and Janitrol units. This cap threads onto the liquid line service port to provide a secondary, leak-tight seal that protects the Schrader valve and prevents slow refrigerant loss.
A missing, cross-threaded, or O-ring-less cap is a frequent source of gradual refrigerant leaks and contamination at the service port. Replacing it with the correct OEM cap and fresh O-ring restores a proper seal and keeps the charge where it belongs.
The OEM Goodman cap guarantees correct thread pitch and an O-ring rated for refrigerant service, ensuring a reliable seal. Generic brass service caps are widely available and inexpensive, but confirm thread size and that a compatible O-ring is included before substituting.
Very Easy (~5 minutes). Seat the O-ring, hand-thread the cap, and snug it lightly with a wrench — do not overtighten. Note: the cap is a seal, not a valve; if the underlying Schrader valve is leaking, have a licensed HVAC technician service it.