Vapor Recovery Unit

A vapor recovery unit collects the vapors given off by gasoline and other fuels so they do not escape into the atmosphere, most visibly at filling stations, where a vacuum pump built into the fuel dispenser creates negative pressure that, combined with pressure inside a vehicle own tank, draws vapor back through the nozzle and a return hose instead of releasing it into the air. The same principle is applied to tank storage in the chemical, oil and gas industries. In Australia, for example, vapor recovery is compulsory at metropolitan filling stations, with a lighter VR1 standard for stations selling under 500,000 liters a year and a stricter VR2 standard above that, and the technology purpose throughout is cutting noxious and potentially explosive fumes and pollution while recovering vapor that can be put back into production. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/