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The Goodman B9102097 is a genuine OEM liquid line service cap with O-ring for Goodman WPC4349AHAA condensing units. The cap threads onto the liquid line service port and forms the secondary seal that keeps refrigerant in and contaminants out. The integrated O-ring is the critical sealing element — a dried, cracked, or missing cap or O-ring is a frequent source of slow refrigerant loss, which shows up as gradually weakening cooling. Replacing the cap restores a leak-tight port seal.
The genuine Goodman OEM cap matches the exact thread pitch and port diameter, and ships with the correctly sized O-ring already fitted. Generic caps may cross-thread or use an O-ring of the wrong durometer or size, risking a slow leak at the seal. For a service port that must hold refrigerant pressure, the OEM cap is the reliable choice.
Easy (1 of 5). Hand-thread the cap onto the service port and snug it to seat the O-ring — do not overtighten. Inspect the O-ring for nicks before installing. After fitting, a licensed technician should leak-check the port. Note: any work that opens the refrigerant circuit must be performed by an EPA-certified technician.