Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
October 9, 2007
Patent Application Number
11214715
Date Filed
August 31, 2005
Patent Primary Examiner
Patent abstract
The vented port-cap includes a check-valve, which admits air into the barrel of the hydrant when the pressure inside is lower than the pressure outside. After an inspection of the hydrant, the hydrant can be left to drain by itself, even though the port-cap has been replaced and tightened.
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