Put More Water in your Champion 4 Toilet. Add up to 5 inches more water in your tank Overflow Tube extensions fit inside Add More Water to Your Champion 4 Toilet This package includes two ABS extension tubes for the Champion 4 flush valve and a tube of silicone glue. There are two different lengths of overflow tube extensions that fit inside your Champion 4 overflow tube and will increase the water level in your toilet tank from two inches to about four inches. Your Champion 4 toilet will flush better with more water. The increased weight of water in the toilet tank will hold the flapper valve seal down so the flapper will seat and not leak. Otherwise, the flapper tends to float and not seat due to the inadequate weight of water above it. The extension tubes will increase the weight and level of water, thus holding down the flapper and preventing leaks. Choose the length that works best for the height of your toilet tank. The extension tubes are easy to press into and pull out of the overflow tube, allowing you to choose either the taller or shorter size for the best flush before you glue it in. Make sure the extension tube does not sit higher than the handle hole. The Champion 4 overflow tube is tapered, meaning that the further you press in the extension tube, the better the seal. Once satisfied with the fit, glue in your extension tube to make your Champion 4 toilet flush better.