The replacement parts side brush compatible with Shark AV2501S/ AV2501AE/ RV2502AE/ RV2520AOUS/ AV2510AOUS Vacuum Cleaner. No tools required, easy to replace the side brush. To keep your AV2501S/RV2502AE AI Robot Vacuum running at high performance, the brushes are recommended to be replaced every 2-3 months.