The U24 o-ring is used for many of the older Omni systems.
This is the replacement O-Ring for older OmniFilter Systems including the U24, Omni Super, Omni Deluxe, Omni Regular, OT2, Total Plus, and many other older filter housings.
Special Note:
If your older Omni system has the "blue" O-Ring then you need the
K4 O-Ring. If it's black you need the U24 O-Ring.
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