This pet door is called the MaxSeal Wall Mount and is produced by Security Boss Manufacturing. It provides the best insulation in comparison to any pet door on the market and in the long run it will pay for itself in energy savings. The innovative flaps are weatherized, which helps maintain the shape and flexibility in hot and cold climates. It is UV treated deterring any discoloring or cracking in direct sunlight. Stainless steel strike plates are riveted along both sides and base of the flap, which connect to high powered almiko magnets embedded in the frame. The almiko magnets are stronger then most magnets offered in pet doors. Pile brush material lines the perimeter of the flap when closed eliminating any drafts or air leakage. The insulated security panel that’s included with every MaxSeal is the only one of its kind on the market, and when in place with the industrial grade pin lock is nearly intruder proof. A unique feature of this door is the trimmable tunnel, which can be cut down to fit any wall width you have, unlike most tunnels included with pet doors that are segmented causing stress points over time directly leading to inefficient seals. This tunnel with maintain its shape and integrity over time. This pet door is entirely built with rust resistant components and its heavy duty frame is the strongest in the industry.