Talk:Check valve

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I frequently install double check valves on existing lawn sprinkler systems that use other types of obsolete backflow devices or none at all. The statement that most homes or buildings have check valves is incorrect. H2O 18:09, 30 Jun 2004 (UTC)

[edit] Duckbill valve

The Duckbill valve is also a check valve —The preceding unsigned comment was added by 62.79.30.244 (talk) 12:55, 1 February 2007 (UTC).