Back siphonage-The flowing back of used, contaminated, or polluted water from a plumbing fixture or vessel into a potable water supply because of negative pressure in the pipe.
back siphonage (contre-siphonnement, m.) The reversal of normal flow in a system caused by negative pressure in the supply piping.
Back siphonage - The reverse flow of liquid caused by siphonage from a cistern or appliance into the pipe feeding it, can lead to a contamination of the water supply.
A device to prevent backflow (back siphonage) by means of an opening through which air may be drawn to relieve negative pressure (vacuum).
Vent Stack ...
Back Siphonage - The flow of water or other liquids, mixtures, or substances into the distributing pipes of a potable supply of water from any sources other than its intended course, due to a negative pressure in such pipe.
This protection prevents back siphonage of toilet tank water into your home's potable water supply system if a vacuum occurs in the toilet's water supply system.
 See also: Table, Device, Water, Building, Area
  
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