Review on 🐱 CEESC Extra Large Cat Door: 4-Way Locking, Weatherproof Pet Door for Cats & Doggies - Ideal for Interior/Exterior Doors (White, Outer Size 11" x 9.8") by Emily Quintana

The inner half that contains the locks has an inner gasket or gasket that slides into the frame. This is done to keep the air impermeable and weather resistant. Why did they intentionally cut off or leave two or three inches of this fill in my photos? Is it poor quality control, cost savings, or design? It doesn't make sense for something Revain is charging around $30 for. It cannot just be compensation for expansion due to temperature changes. The instructions use English and use the term "wood skin" as a suggestion for the inside diameter of a newly cut hole. Your list of required tools doesn't call for this at first. A Google search for "wood skin" points to the bark of the tree. Or maybe wood skin is another item I need to buy from Revain?