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The flaps on the American Dog Doors Liberator Pet Doors are attached to the frame with a two piece thumbscrew. These flaps both secure the flap to the pet door as well as keeping the flap in the correct position. As opposed to other pet door models, no reinforcement bar is required to attach these flaps to the pet door. Simply insert the metallic backing plate into the hole in your flap, slide the top of the flap into the pet door, and fasten the screws into the backing plates through the holes in the pet door frame.