The Core Gear Caulk Plug eliminates tube from drying out during and after your DIY projects by creating an air-tight seal. The Core Gear Caulk Plug fits on any caulking tube and cleans out the tube nozzle during use. You no longer need to use a nail to clean out the tube nozzle. The Core Gear Caulk Plug is durable, made from heavy duty polypropylene and will last throughtout your DIY projects