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It is possible to insert the cat flap onto an upvc panel or double glazing sealed unit. The best solution is to put in an entirely new glass pane that has a hole that is already made. Follow the instructions provided with the kit. Make sure that the template drawing accurately represents the shape (circle or square). Safety A microchip activated pet panel in your upvc door is a fantastic option for those who have a dog or cat and would like to let them out into the garden, but do not want to leave the door open. This will only let your pet in, and p