Fits Sanitaire Commercial SC3683, SC3684, SC3687, SC3863 Series Canister Vacuums; Eureka 3620, 3621, 3624, 3630-3632, 3640, 3641, 3650, 3651, 3670-3676, 3679, 3680, 3682, 3684, 3685, HD3684 Series Canister Vacuums and Sanitaire Professional S3681, S3686 Series Canister Vacuums.