The FloBack seal located behind the centrifugal disc protects the interior of the bearing from fine dirt. L3 seals can be ordered for all housing bearing inserts in the UC series. Due to the higher friction, these products can be used for low to medium speeds.

LT3 seals are also an alternative: They have three lips and are particularly firm on the inner ring, which creates a high level of friction. This doubles the torque, but this seal also protects against extreme dirt and mud.