Staff Answer
Sep 14, 2026 - 10:30 AM
The O-ring that fits the CircuPool Core 55 model for the replacement union and collar is the CircuPool CORE / CORE CONTROL Small O-Ring Set, which is specifically for union connections:
https://www.discountsaltpool.com/circ...
The other Large O-ring, link below, is for the connection between the controller and the cell:
https://www.discountsaltpool.com/circ...

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