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The Dupree Twis-Loc valve was originally developed and marketed as the Owens Valve in 1964, and has been in production ever since.
The Twis-Loc Valve has been installed by many manufacturers during this time, such as Airstream, SilverStreak, Blue Bird, Newell and numerous other bus and recreational vehicle manufacturers. The Twis-Loc's significant feature is its certainty of operation and valve position with all parts being easily replaceable.
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