Fluval 104, 105, 204, 205, 106, 206 Replacement Motor Seal Ring (A-20038) Replacement Motor Seal Ring for Fluval 104, 105, 204, 205, 106 and 206 canister filters. Fluval part A-20038. Measures 1/2-inch length by 4-inch width by 6-5/7-inch height Fits Fluval 105, 205 external filter models A201, A206