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 organisms such as TB and HTLV-III virus. 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. “Vacucap®” 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. 13 mm style can also be used on most 12 mm plastic test tubes.