Compact OmniFilter OB1 Replacement Filters for Newer Models

If you own an older OB1 Whole House Filter with the original BLUE o-rings, you will need a smaller o-ring. Avoid purchasing these o-rings, and instead look for our listing specifying Older OB-1 Whole House Filter o-rings in the original blue color. This is part of the OK4 package.

The o-rings that fit the newer OB1 Whole House Filter are original and come in the color black. This is part of the OK25 package, and it includes 10 o-rings of the same size.

However, these o-rings do not fit the older OB1 system that uses the original Blue o-rings.

When it comes to the older OB1 Whole House Filter, the original BLUE o-rings need to be replaced with a smaller size. Avoid purchasing the incorrect o-rings and instead, look for our listing that specifically states "Older OB-1 Whole House Filter o-rings, original color blue." This is part of the OK4 package.

On the other hand, the o-rings designed for the newer OB1 Whole House Filter are original and come in the color black. This is part of the OK25 package, which includes 10 o-rings of the same size. However, these o-rings are not compatible with the older OB1 system that uses the original Blue o-rings.

In summary, if you have the older OB1 Whole House Filter, you need to replace the original BLUE o-rings with a smaller size. Make sure to refer to our listing that specifies "Older OB-1 Whole House Filter o-rings, original color blue," which is part of the OK4 package. The o-rings for the newer OB1 Whole House Filter are black in color and part of the OK25 package, but they are not suitable for the older OB1 system.

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