Many toilet tank flappers are adjustable;
they have a hollow chamber in them and a little sliding cover that you can turn to adjust how fast it sinks, thanks to different sized holes that you will expose the water and air to.
That changes how long it will stay up, & how fast it will close the flow of water from the tank to the bowl.
If you wanted to be cheap and economize on your water bill you set it one way.
If you want a powerful flush that'll drag a Los Angeles class submarine down ...
turn the cover the other way.
they have a hollow chamber in them and a little sliding cover that you can turn to adjust how fast it sinks, thanks to different sized holes that you will expose the water and air to.
That changes how long it will stay up, & how fast it will close the flow of water from the tank to the bowl.
If you wanted to be cheap and economize on your water bill you set it one way.
If you want a powerful flush that'll drag a Los Angeles class submarine down ...
turn the cover the other way.