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The Goodman B9102097 is a genuine OEM liquid line service cap, supplied with its sealing O-ring, for the GPC1360H21A packaged air conditioner. This cap threads onto the liquid line service valve port to provide a secondary, leak-tight seal over the Schrader core. A missing cap or a dried-out O-ring is a common, slow source of refrigerant loss and a primary leak point during seasonal pressure cycling.
The genuine Goodman OEM cap is sized to the valve's exact thread pitch and ships with the correct durometer O-ring rated for refrigerant service. Generic caps may lack the O-ring or use an incompatible seal that hardens and leaks. Because this part protects the sealed system, OEM is strongly recommended.
Very easy. Hand-thread the cap onto the service port until the O-ring seats, then snug lightly — do not over-tighten. Typical time: under 5 minutes. No tools, recovery, or evacuation required for the cap itself.