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If you want to install a cat flap in your home, it is recommended to employ a professional tradesperson. DIY projects typically result in poorly-fitted pet flaps that let in draughts or increase energy bills. SheffLOCK can be installed as a cat flap in most types of doors including wood composite, uPVC, composite, glass doors as well as exterior walls. It takes about 2 hours to put in the new cat flap. Pet flaps cost money A pet flap permits your cat to come and go wh