The Glass Adaptor Kit for the Small Passport Cat Flap lets you install your cat flap in glass doors or windows. The Passport Cat Flap can be installed in a glass door or window that is at least 3 mm thick, and the glass pane should be no wider than 815 mm. The minimum size of a glass pane appropriate for this Cat Flap is 407 mm wide by 445 mm high.
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