Endura Flap Door Mount Cat & Dog DoorDescription Endura Flap by Patio Pacific Door Mounted Cat & Dog Door The Endura Flap Pet Door is designed to be installed in doors, including solid core, hollow core, panel, metal and storm doors. The Endura Flap dog door utilizes the best pet door flap in the industry making it the number one choice pet door for extreme weather. The state of the art flap technology gives Endura Flap dog doors the ability to combat 50mph winds and 40 degrees