Invention of Flush Toilet.

Plumbing means a system including both supply and drainage of water.
A flush-toilet therefore, means a toilet in which water is used to drain off the human wastes out of the house.
This system was introduced in the Indus valley about 2500-3000 years ago but almost disappeared thereafter.
It was in 1778 that Joseph Bramah of England restarted the flush-toilet system.
It was in 1860's that Sir Thomas Crapper, an English plumber, improved the flush toilet system of Joseph Bramah.
He made improvements so that water could automatically stop flowing into the reservoir when it was full.