The Dupree Twis-Loc valve was originally developed and marketed as the Owens Valve in 1964, and it has been in production ever since. The Twis-Loc Valve has been installed by many manufacturers during this time such as, Airstream, SilverStreak, Bluebird, Newell and numerous other bus and recreational vehicle manufactures. The Twis-Loc's significant feature is its certainty of operation and valve position with all parts being easily replaceable. [[File:Dupree Twis-Loc Manual Valve Exploded Parts Drawing.jpg|frame|Dupree Twis-Loc Manual Valve Exploded Parts Drawing]] | The Dupree Twis-Loc valve was originally developed and marketed as the Owens Valve in 1964, and it has been in production ever since. The Twis-Loc Valve has been installed by many manufacturers during this time such as, Airstream, SilverStreak, Bluebird, Newell and numerous other bus and recreational vehicle manufactures. The Twis-Loc's significant feature is its certainty of operation and valve position with all parts being easily replaceable. [[File:Dupree Twis-Loc Manual Valve Exploded Parts Drawing.jpg|frame|Dupree Twis-Loc Manual Valve Exploded Parts Drawing]] |