Description Aluminum Frame with Energy Efficient Ultra-Flex Flap The Ultra-Flex flap on the Premium Draft-Stopper™ Pet Doors feature dual pane LEXAN® hard panels with an air gap in-between for maximum energy efficiency and wind resistance.In addition, the flaps innovative design helps eliminate the potential for trapping ears, paws and tails.Pet Door Features IncludeMaximum energy efficiency.Inner telescoping frame that adapts to doors of 1" to 1 3/4" thickness.Flap Sizes:Medium - 6 5/8" x 11 1/4" andExtra Large - 10 1/4" x 15 3/4"Spring loaded locking slide for one-handed use.Low maintenance and durable.Easy, secure installation of these pet doors.
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