The Staywell® Original 2-Way Pet Door offers your dogs and cats the freedom and independence to come and go as they please. The 2-way pet door provides pet parents the option of snapping on a closing panel from the inside for convenient control over their pet’s coming and going. With the provided cutting template and easy installation guide, fitting this pet door is a simple DIY project. An optional tunnel extension made for thicker doors and walls is included with the medium and large size pet doors and is sold separately for the small size pet door. This pet door works with brick walls, and wooden, metal or PVC/uPVC doors, and includes a 3-year manufacturer’s warranty. The PetSafe® brand is here to help you and your pet to live happy together™.