A flush hydrant for purging waterline systems of subdivisions, rural districts, etc. The flush hydrant is used in lieu of a typical fire hydrant for purging such waterlines of foreign matter which may have infiltrated the waterline system as a result of line breakage. The flush hydrant includes a barrel...http://www.google.sh/patents/US4756479?utm_source=gb-gplus-sharePatent US4756479 - Flush hydrant
