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The Goodman B9102097 is a genuine OEM liquid line cap with an integrated O-ring, designed to seal the liquid line service port on the WAHMS4961P4ACA air handler. This cap maintains a refrigerant-tight seal at the connection, preventing slow leaks that degrade system performance and cause compressor strain over time.
The integrated O-ring is what makes this a true seal rather than just a dust cap. The OEM B9102097 uses the correct O-ring durometer and cap thread pitch for a leak-free fit. Generic caps may have mismatched threads or a hardened seal that weeps refrigerant — a small part whose failure can cause an expensive charge loss.
Easy — hand-tighten onto the service port after the line is properly charged and the O-ring is seated. Allow 5–10 minutes. Inspect the O-ring for nicks before installing and apply a leak check after tightening.