The devices also allow the flow of new water into the toilet or urinal during the flush by opening of a diaphragm. William Elvis Sloan invented the Royal Flushometer near the turn of the 20th century.

I was going to erect a wall and the pipe was right in the way. I needed a flushometer to go flush with that wall. But the actual 4x6 carrier inside the wall wasn't close enough to the flushometer ...