The Patio Pacific Thermo Panel 3e pet door has become one of the top solutions for someone in need of a Pet Door for their sliding glass door. With superb insulation value it makes this panel twice as energy efficient as the single paned pet panel. By combining dual pane and low "e" glass along with a high quality Endura flap, you are receiving a pet door panel that will satisfy all your needs. Included on the panel is a draft-stopper, making the flap highly wind resistant. Additionally, with a heavy, thick metal frame and locking cover, your panel will be extremely durable and last you a long time. One convenience feature that many others find to be a selling point is the ease of installation for this panel. You will not need any tools, and with an extra built in feature, you are given a bit of room to correct any measurement error with our anti-whoops feature. This will grant you the ability to make this panel a perfect fit in your doorway.