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The B9102097 is a genuine Goodman liquid line service cap with an integrated O-ring seal, engineered for the WGHP4460AAD packaged heat pump and other compatible Goodman/Amana air conditioning systems. This small but critical fitting seals the liquid line service port against refrigerant loss, keeping the sealed system at proper charge and protecting against moisture intrusion. A worn or missing cap is one of the most common causes of slow refrigerant leaks, so replacing it with the correct OEM part is cheap insurance for the whole system.
Choosing the genuine Goodman B9102097 guarantees an exact thread match and a correctly sized O-ring that seats the first time. Generic caps are often close but not exact — an undersized or hard-durometer O-ring can weep refrigerant over time, leading to repeat service calls. For a part this inexpensive, OEM is the smart choice.
Hand-tighten onto the service port over a properly seated O-ring; no brazing or refrigerant recovery required for the cap itself. Always confirm system pressure and follow EPA 608 guidelines when working near the refrigerant circuit. Most DIY-capable owners and all HVAC techs can complete this in minutes.