There comes a time in the life of almost every toilet when the fill valve has to be replaced. The fill valve is the mechanism inside the toilet tank that controls refilling the tank after each flush. Often, a fill valve goes bad because of the build-up of mineral deposits from the water that begins to interfere with the opening and closing of the valve, leading to a toilet that’s constantly running. Fill valves are inexpensive enough and not that complicated to install. Doing it yourself can save the cost...