The Ultra-Flex flap features dual pane LEXANŽ 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. Features Include * Maximum 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" * Extra Large - 10 1/4" x 15 3/4" * Spring loaded locking slide for one-handed use. * Low maintenance and durable. * Easy, secure installation. 
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| Ideal Draft-Stopper Pet Door Medium Medium 6 5/8 X 11 1/4" opening Cut out dementions 8 1/4 X 13 5/8" |
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| Ideal Ultra Fex Pet Door XLarge 10 1/4 X 15 3/4 flap size Cut out size 12" X 17 1/2" |
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| Ideal Draft-Stopper Pet Door, ideal ultra flex, ideal pet door |