I have successfully installed a Toto Drake unit in my 20 year old house. All is well except that when I ran several trial flushes the tank did not drain very much at all. I watched the flapper valve, and it did not stay in the open position very long, therefore not much water left the tank. The chain seems adjusted properly, as it lifts the flapper and comes up against the overflow tube. Any suggestions?
Thanks, FP
Thanks, FP