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Imagine a pet door installed behind a couch or in a utility room. The wall entry door can be installed in interior or exterior walls or doors 4-3/4 to 7-1/4 in thick including siding stucco and even brick. Add an extension tunnel for deeper walls. This pet door features two flaps one in the inner frame and one in the outer frame for improved energy efficiency. Alternative location; adjustable telescoping wall tunnel. For interior walls brick walls wood or siding walls stucco or alternative walls 4-3/4to 7-1/4thick.