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.
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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