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It is possible to insert the cat flap onto an upvc panel or double glazing sealed unit. The best option would be to install the glass pane from scratch using a hole that is already made. Read the instructions that should be provided with the kit for cat flaps, and follow them closely. Make sure that the shape you have drawn (be it a square or circle) is accurately represented on the template. Safety If you have a cat or dog and would like to let them in the garden without opening the door, a microchip-activ