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The Goodman B9102097 Liquid Line Cap with O-Ring is a genuine OEM sealing cap for the liquid-line service connection on WAHME1830P4ABA and compatible Goodman/Amana air handlers. The cap, paired with its pre-installed O-ring, provides a leak-tight seal that keeps the factory refrigerant charge contained and prevents moisture and contaminants from entering the line set. A missing cap or a dried-out, cracked O-ring is a frequent source of slow refrigerant leaks.
The OEM cap is threaded and sized to the exact line fitting and ships with the correct durometer O-ring, so it seals to spec without overtightening. Generic caps may seat but often use a mismatched O-ring that weeps over time. For a refrigerant-tight seal, use the OEM part.
Easy. Hand-thread the cap onto the liquid-line fitting and snug it with a wrench — typically a 5-minute job. Confirm the O-ring is seated and undamaged before tightening. No refrigerant recovery is required to replace the cap itself, but any line work should be performed by an EPA-certified technician.