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The Goodman B9102097 is a genuine OEM liquid line service port cap supplied with its sealing O-ring, made for the APH1542M41AA package heat pump. The cap seals the liquid-side service/charging port, providing a second line of leak protection against the port valve and keeping dirt and moisture out of the refrigerant circuit.
Replace the cap and O-ring whenever the seal is missing, cracked, or hardened, or after any service that disturbs the port. A fresh O-ring is inexpensive insurance against a slow refrigerant leak.
OEM B9102097 provides the exact thread pitch and an O-ring in the correct durometer and diameter for a positive seal. Generic caps may thread on but seal poorly or lack the O-ring, allowing seepage at the port. The OEM cap seals to factory spec.
Moderate — Thread the cap on hand-tight plus the specified fraction of a turn to compress the O-ring; do not overtighten. Because it protects a pressurized refrigerant port, have a technician verify no leak after service. About 5–10 minutes.