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The Goodman B9102097 Liquid Line Cap with O-Ring is a genuine OEM service-port sealing cap for CPC150XXX4BXXXAA commercial package air conditioners and compatible Goodman/Amana condensing units. This cap seals the liquid-line service valve port after charging or service, providing a secondary leak-tight barrier against refrigerant loss and keeping moisture and contaminants out of the Schrader core.
The genuine Goodman OEM cap ships with the correct O-ring durometer and thread pitch for a guaranteed seal. Generic caps may use a mismatched O-ring or omit it entirely, risking slow refrigerant leaks at the service port. At this price point, the exact-fit OEM part is inexpensive insurance against losing a system charge.
Hand-tighten the cap onto the service port over a properly seated O-ring, then snug with a wrench per manufacturer torque guidance. Best installed by an HVAC technician during routine service, after the Schrader core has been verified leak-free.