25mL Tube, Reaction, Airfree, Schlenk, 14/20 Outer Joint, 0-4mm Valve. Cylindrical shaped tube useful for storage or simple reactions with a standard taper outer joint at the top and a Chem-Vac™ Chem-Cap valve sidearm. Plug may be removed for sampling from tube while a purge of inert gas is maintained through the sidearm. Valve size is as listed.