The OmniFilter OK7 is the replacement O-Ring for the Omni Filter BF7 whole house water filter system. This kit also includes an OmniFilter OK50 O-Ring (OK50-R-01), which also works in the BF7 (BF7-S-05).
The OK50 O-Ring fits the new Series A BF7, whereas the OK7 O-Ring fits the older units. To avoid confusion, OmniFilter packages these o-rings together to ensure you get the appropriate o-ring for your system.
This product was known previously as model numbers OK7-R-01 and OK7-R-02 and is now known by model number OK7-S6-05.