 Photo courtesy of valued customer, Mike B., Illinois Click photos for larger images | How To Assemble Cap-TubeTM Air-Tite Tubes To put the end cap on the tube you will need to apply steady pressure to the end cap for several seconds. This will allow the air to completely escape from the tube and form a proper seal. If the cap tries to pop off when you remove pressure, continue pushing the cap onto the tube for a few seconds longer. When you remove pressure the cap should remain in place with a vacuum like seal.
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