Review on Korky 2001TP Universal Toilet Tank Flapper (3 Pack): Easy Install, Long-Lasting Rubber Seal, Made in USA by Patrick Diaz

Easy to install. I don't know why I waited weeks to fix them. If you can replace a lightbulb, you can install it. My old ones have hardened and lost their seal. I keep shaking the handle to stop. Install these guys and "voila", the problem is solved. Simply give the ring a quick rub to remove any mineral deposits. Install a new part and adjust the chain. test flush. Finished. If the chain has too much slack, it can affect throttling. You may need to shorten it.