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If you want to install a pet flap on your uPVC door or glass panel, then you're going to need the services of an expert cat flap installer. They can also help you with more advanced models like microchip pet flaps. DIY attempts to install a pet flap often result in problems like draughts or low energy efficiency. A professional tradesperson can save you the hassle and expense of addressing these issues. Cost There are a number of factors that influence the cost of cat flap installation. The type of flap you select