Replacement vacuum cleaner belt. The drive belt is a critical component of your vacuum that allows the brush roll to spin and help remove dirt and debris from carpets. Regular replacement of the belts helps your vacuum operate at peak efficiency. Compatible with models Bissell Lift-Off Revolution Model No. 3750, 37601, 4220, 6595, 6801, 6850, 6860, and 89Q9 series. 2 belts per package.