The Fluval Replacement Rubber Adapter for ribbed hosing comes in a pack of two and is suitable for the Fluval 104 External Power Filter (A200), the Fluval 204 External Power Filter (A205), the Fluval 105 External Canister Filter (A201), the Fluval 205 External Canister Filter (A206), the Fluval 106 Canister Filter (A202) and the Fluval 206 Canister Filter (A207).