The Tesla Valve

http://bit.ly/1uDvDPJ Nathans writings on the Tesla Valve - http://bit.ly/1MsD1Wr The Tesla Valve was invented in 1920 by Nikola Tesla. It is also known as Tesla's valvular conduit. It is a one way valve with no moving parts.
via YouTube
https://youtu.be/rYlP5TEKf2w