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Professional cat flap installers will install your pet's door into either a door, or a wall. The wall-mounted version is more secure as an intruder cannot reach through. It also reduces energy bills and prevents draughts. The Tasker will mark the position of the cat flap on your door, then drill the corners. They will also sand the edges of the frame for a smooth finish. Microchip cat flaps A microchip cat door is an easy and effective way to keep your pet inside