These vacuum desiccators are made of clear polycarbonate. These autoclavabale vacuum desiccators can hold vacuum up to 740mmHg for 24hrs without greasing. The dome, moulded in rigid and transparent polycarbonate, gives a clear view of the desiccant placed inside. The knob on the top provides easy handling of the dome. An internal groove is provided on the flange to hold a silicon rubber O-Ring. The polypropylene stopcock is fitted with a self lubricating PTFE plug.