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The genuine Goodman B9102097 is a liquid line service cap with an integrated O-ring seal, designed for the WPH4324AMAA packaged heat pump and compatible Goodman/Amana units. This cap protects the liquid line service port and maintains a leak-free refrigerant seal at the connection point. Using the correct OEM cap prevents slow refrigerant loss and keeps your sealed system operating at rated efficiency.
The OEM B9102097 ships with a factory-matched O-ring durometer and thread pitch guaranteed to seat against the exact port on your unit. Generic caps often use a mismatched O-ring size that can extrude or fail to seal under high-side pressure, leading to a slow leak that is difficult to diagnose. For any pressurized refrigerant connection, OEM is the safe choice.
Fitting the cap itself is simple hand-and-wrench work, but any service on the refrigerant circuit should be performed by an EPA 608-certified technician. Recover or isolate refrigerant as required, seat the O-ring cleanly, and torque to spec. Verify with a leak check before returning the system to service.