Thanks for your question.
Yes, the selling unit of each for the Turbo Air 30223U0200 Door Gasket refers to 1 gasket per order. A replacement gasket like this one usually fits/replaces the rubber gasket lining the inside of your door, so when you order this product you'll get 1 gasket, but it will be sufficient to replace a faulty or broken gasket on your end.
Thanks again for contacting Tundra Restaurant Supply with your question.
Answered on 2/7/2013 by Andrew Call from Boulder, CO