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The Goodman B9102097 Liquid Line Cap with O-Ring is a genuine OEM sealing fitting for the WGHP4636AAE packaged heat pump. It threads onto the liquid line service port to provide the secondary, leak-tight seal that protects the Schrader core and keeps the refrigerant charge contained. The included O-ring is the correct durometer and size to seat properly without over-torquing.
An exact-fit OEM cap and O-ring guarantee the thread pitch and seal geometry match the port, delivering a reliable secondary seal. Generic caps may use the wrong O-ring material or size, allowing slow refrigerant loss that is hard to diagnose. For EPA-regulated refrigerant integrity, the OEM part is the right call.
Difficulty: Easy. Hand-thread the cap onto the service port over the O-ring and snug per spec — typically a 5-minute job. No refrigerant recovery is required to replace the cap itself.