Quick Adjusting Bypass technology is available as an option for all new 2.5, 3.0, and 3.5 FOX External Bypass shocks or as an upgrade. The QAB allows you to manually adjust bypass tubes, quickly and easily, making fumbling with tools and visually counting turns obsolete. The adjuster has the same flow and range of adjustment as a regular bypass units. The new design has a definitive click at every quarter revolution of the knob. An O-ring seal keeps moisture and contaminants out.