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That is a plug door.  It rolls on a track, but when it gets to the doorway cam action forces it inward into the opening.  The door has rubber seals all the way around it. To get a good air and water tight seal around the door a good deal of force can be  required to cam the door in tight. The big wheel replaces the three foot piece of pipe most people dealing with these doors used. 

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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