If you have an older toilet that uses more water than necessary to clear the bowl, attaching this little device to the fill hose can reduce the amount of fill cycle water by as much as one-half gallon per flush. This device can be installed in just four steps.
Pull hose out from the overflow tube
Remove the hose clip or holder, if any
Insert the Toilet Fill Cycle Diverter into the end of the hose
Clip the Toilet Fill Cycle Diverter onto the overflow tube, with one if its arms inside and one of its arms outside the overflow tube