Hoover WindTunnel Canister Vacuum Cleaners Roller Brush and Belt Kit. For Models S3630, S3630-050, S3639, S3646, S3649, S3661, S3670, S3670-050, S3670-055, S3755, S3755-080, S3765, S3765-040. Hoover Canister Vacuum Cleaner Model S3630 Hoover Canister Vacuum Cleaner Model S3639 Hoover Canister Vacuum Cleaner Model S3640