Inside a urinal auto-syphon.

I've always wondered what's inside the syphon assemblies used to flush the urinals in UK public toilets on a regular basis. I thought it would be a simple syphon with a pipe up the middle and an outer dome, but it's MUCH more complicated than that.

The mrmattandmrchay channel has done an epic video reverse engineering this syphon to work out how it manages to initiate a high volume syphon with very low water fill speed.
   • The AUTO SYPHON cut open - how it works  

This device must have other applications too. From providing splashes of water in water-play areas to ebb and tide style hydroponic systems.

If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random plumbing accessories for disassembly at:-
http://www.bigclive.com/coffee.htm