An economical way to recap blood drawing tubes, disposable glass test tubes, and plastic culture tubes. Flexible Vacucap™ closures protect from aerosols of highly infectious microorganisms. They guard samples against cross-contamination and laboratory work areas against infection and spillage. Precision molded from low-density polyethylene, with a double-flanged seal, Vacucap™ clamps firmly on the tube and holds fast under most rigorous procedures, including centrifugation. Not suitable for autoclaving. Designed for easy-on, easy-off use, due to the exclusive Dual Thumb Tab. Cap removal is simple and quick. Ideal for recapping most 13mm and 16mm O.D. evacuated glass blood collection tubes. 13mm style can also be used on most 12mm plastic test tubes.