A hydrant coupler is a type of aircraft fueling equipment which opens and allows fuel to flow through the hydrant cart into the aircraft. A hydrant coupler needs 60lbs of air pressure to open up the pit valve[clarification needed] to allow the flow of fuel. Hydrant couplers run off a pressure fueling system consisting of fuel and air pressure.
![](http://upload.wikimedia.org/wikipedia/en/thumb/c/cf/Hydrant_coupler_plans.jpg/220px-Hydrant_coupler_plans.jpg)
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