Endura Flap Panel Height and Sash Width Extensions

Extension for Endura Flap Thermo Panels & Thermo Sashes and Dragon Panels & Sashes with aluminum frames (will not work with vinyl framed pet door) Part of the anti-whoops design feature on all Thermo panels and sashes Gives you an extra 3/4" added to the panel or sash adjustment range Three colors and four sizes to match your pet door Thermo Panel Height and Thermo Sash Width Extensions These are a part of the exclusive anti-whoops feature on all Endura Flap patio and sash window pet doors. The extension is also compatible with Dragon and Whiskers & Windows brand aluminum panels. You mismeasured! Now you have to send the pet door back for the correct size. Not so fast! If you purchased a Thermo Panel or Thermo Sash you might be able to salvage the situation by using the "anti-whoops" feature: To make your panel 3/4" taller or your sash 3/4" wider, you may purchase an extension (or create your own using a 1" thick piece of wood painted to match). To make your panel sligh