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The genuine OEM Goodman B9102097 liquid line cap with O-ring seals the liquid-line service port on ARPF303016CA air handlers and compatible Goodman/Amana coil sets. This brass-style cap with its captive O-ring provides a secondary, leak-tight seal over the service valve, protecting the refrigerant charge and keeping moisture and debris out of the system. Replace a lost, cross-threaded, or O-ring-worn cap to maintain a sealed, code-compliant connection.
The OEM cap uses the correct thread pitch and an O-ring rated for refrigerant and oil exposure, giving a positive secondary seal. Generic caps may use mismatched threads or low-grade O-rings that harden and weep, risking a slow charge loss. At this price, the factory cap is cheap insurance for your refrigerant circuit.
Easy (1/5). Hand-thread the cap onto the liquid-line service port and snug per manufacturer torque spec — typically a 1–2 minute job. Ensure the O-ring is seated and the valve core stem cap underneath is tight before installing.