Lockable Cat Flap for Indoor/Outdoor Cats - White Pet Door with Security Key - Perfect for Homes, Apartments & Garages

Smart engineering and quality manufacture made this cat door a pleasure to install and use. I put it in the lower panel (1/8" aluminum) of my storm door. It seals against drafts pretty well, and I can't see any obvious points of wear or stress that would lead to future problems. Following the simple directions led to a good outcome. The only minor niggle was sticky movement of the sliding latch, but a couple of minutes with a scalpel, excising some untrimmed molding flash, got it moving smoothly. Some installation tips:1. When placing the template on your door, use a bubble level across the top of the template.2. Use a jig saw with the appropriate blade (fine-toothed metal-cutting blade in my case).3. Cut/file the opening so that the door frame slips in with zero force, so as not to distort the frame and bind the door.4. When marking the screw hole locations, use a bubble level (again) across the top of the inner frame.5. Drill the screw holes in the door a little smaller than suggested, 9/64" rather than 3/16"; this snugger fit will ensure that the door remains plumb as you install the screws, assuming that you levelled it as above.6. Vacuum meticulously afterward: the last thing you want in your feet (or your cat's paws) is sharp metal swarf.Being used to the unmodified screen door for 2+ years, my cat was wary (spooked, actually). After I taped the flap fully open, she gingerly approached and peeked outside. After 15 minutes of lurking, she took her first tentative steps through the door. After going in and out through the propped door many times over the next hour, she still would not nudge the fully closed flap, but when I lifted it halfway, she pushed her head under it and the body followed. Not bad for a couple of hours' work!