Nozzles are attached to the pump via flexible hoses, allowing them to be placed into the vehicle's filling inlet. The hoses are robust to survive heavy wear and tear, including exposure to weather and being driven over, and are often attached using heavy spring or coil arrangements to provide additional strength. A breakaway valve is also fitted to the hose to allow the nozzle and hose to break off and fuel flow to be stopped in the case a vehicle drives off with the nozzle still in the filler.
The nozzles are usually color-coded to indicate which grade of fuel they dispense, however the color-coding differs between countries or even retailers. For example, a black hose and handle in the UK indicate that the fuel dispensed is diesel, and a green dispenser indicates unleaded fuel; the reverse is common in the US.
Some different types of fuel have specially sized nozzles to prevent accidentally filling a tank with an incompatible fuel. The nozzle on diesel pumps is supposed to be larger so that it cannot fit into the filler pipe on a vehicle tank designed for gasoline. However, the larger diameter diesel nozzles are not an actual requirement, and many diesel pumps at auto islands have been fitted with standard gasoline nozzles. Also, the nozzle for leaded gasoline is wider than for unleaded, and the fill pipe on vehicles designed for unleaded-only was made narrower to prevent misfueling . Some diesel fuel tanks are designed to prevent wrong type of nozzle to be used.
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