Most toilet leaks are caused by a worn flapper valve. Over time, the soft, pliable rubber flapper valve can become stiff or warped, preventing a good watertight seal. Chemical toilet cleaners in the toilet tank will also take their toll on the flapper and other tank parts. Fix your running / leaking toilet by replacing the flapper valve. This helpful Roto-Rooter video shows you the quick and easy steps to fix it yourself. And if you still need help or the toilet continues to leak elsewhere, call your Roto-Rooter plumber for fast, professional service.