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Fire Hydrant...
Hydrant system is a mechanism where is pumped, tapped off and released in the form of a jet through a nozzle to extinguish fire. Most fire hydrant valves are not designed to throttle the water flow; they are designed to be operated full-on or full-off. The valving arrangement of most dry-barrel hydrants is for the drain valve to be open at anything other than full operation. To prevent casual use or misuse, the hydrant requires special tools to be opened, usually a large wrench with a pentagon-shaped socket.
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