mattnjodie
Plumber
I replaced the flapper in a Kohler elongated bowl toilet that is 10 years old because the old one was hard and every time you'd flush, it went thunk. I replaced the flapper with a universal type. It still goes thunk. To prevent and cure the thunk, do I need to use a flapper like the original (with a float on it)? If not, what is my recourse?