Korky 818CM is a QuietFILL Toilet Fill Valve & Premium Flapper that will help you to save water and money. It is easy to install and comes with a 5-year warranty. The QuietFILL Toilet Fill Valve & Premium Flapper is designed to prevent water from leaking into the toilet bowl when the toilet is not in use. This can save you up to 20% on your water bill. The QuietFILL Toilet Fill Valve & Premium Flapper is also designed to be quiet, so you won't have to listen to the sound of running water when you're trying to sleep.