Dirt Lock – B Grit Guard 

Utilizes the motion of your hand to pump and trap debris underneath the screen. The Dirt Lock has a complex Venturi filtering system that manipulates the flow of water in a downward direction. This allows dirt particles to collect underneath the screen without a way for it to re-enter into the clean water. In short, every time you pump your hand in the bucket you are cycling the dirt underneath the screen and replenishing clean water above to help prevent swirl-marks and scratches on the painted surface.