3pk Compatible for OMNIFILTER Older OB1 Filter O-Rings OK4 – original Blue
Older OB1 Whole House Filter O-Rings Original Color Blue. The new OB1 Series A requires a larger o-ring, part of OK25.
Older OB1 Whole House Filter O-Rings Original Color Blue. The new OB1 Series A requires a larger o-ring, part of OK25.