It is the hydrant of which watering outlets are under ground and cover ison the ground. It consists of stem which controls hydrant valve, spring check valve which makes automatic discharge service, cast pieces forming main body and hose connecting bonets. Opening-closing process is achieved by controlling stem with the help of hydrant key. Spring check valve on body discharges water within hydrant when it is not used and prevents freezing in cold weather. Underground hydrants are used in supplying water for fire brigade in factories, warehouses, industrial plants, around the buildings, fire sensitive forestlands and residential areas.