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Maintain a leak-tight sealed system with the genuine OEM Goodman B9102097 liquid line cap, supplied complete with its O-ring, a direct-fit replacement for the WGHP4442AAE air conditioner. The service-port cap is the secondary seal that prevents refrigerant from weeping past the valve core, and the captive O-ring is what makes the seal gas-tight. A lost, cross-threaded, or dry-rotted cap and O-ring is a frequent source of slow refrigerant loss that's easily and inexpensively corrected.
The genuine OEM cap guarantees the correct thread size and O-ring durometer for a positive seal. Generic caps and mismatched O-rings can leave the port to leak or fail to seat. At this price point, OEM is the obvious choice.
Difficulty: Easy. Seat the new O-ring, thread the cap onto the service port, and snug it to spec — no refrigerant work needed for the cap itself. A quick task, though refrigerant-system service should be left to a licensed technician.