Fluval Rubber Adapter for ribbed hosing, is suitable for:  - Fluval 304 External Power Filter (A210)  - Fluval 404 External Power Filter (A215)  - Fluval 305 External Canister Filter (A211)  - Fluval 405 External Canister Filter (A216)  - Fluval 306 Canister Filter (A212)  - Fluval 406 Canister Filter (A217)