 Ken Moon answers your questions around the house. I have an email here from a listener who says his flapper valve in the toilet leaks. He's replaced it but still have the problem. Any ideas? Well, it's vital when you replace that little flapper valve. That's the valve that lets the water from the tank into the bowl with an exact replacement for the toilet brand in your house. Sometimes the generic or universal kind aren't built to the precision needed to stop the leak. So you need to go to a...