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The Goodman B9102097 Liquid Line Cap with O-Ring is a genuine OEM service fitting engineered for the WGPH4549AMAB packaged gas/electric air conditioner. It threads onto the liquid line service port and, together with its captive O-ring, forms a leak-tight seal that protects the refrigerant charge and keeps moisture and contaminants out of the sealed system. A worn, missing, or cross-threaded cap is one of the most overlooked sources of slow refrigerant loss, so installing the correct OEM cap is cheap insurance for the whole system.
The genuine Goodman OEM cap arrives with the correct thread pitch and a factory-spec O-ring that seats fully on the first turn. Generic caps are usually a few cents cheaper but frequently ship without an O-ring or with an undersized one, which can lead to weeping joints and repeat service calls. For a sealing component on a pressurized refrigerant circuit, the OEM part is the safer choice.
Easy (1/5). Hand-thread the cap onto the service port and snug it lightly — no tools or refrigerant handling required for the cap itself. Always confirm the system is not actively leaking before relying on the cap as the final seal.