UNIVERSAL FITTING “ Additional Tunnel Extensions can be purchased for a fast and simple installation into Walls and Doors of any depth. One optional tunnel (48 mm) for thicker doors is included.For installations into thicker Doors and Walls additional Tunnel Extensions can be purchasedWARRANTY “ The Staywell Deluxe Manual 4 Way Locking Cat Flap includes a 3 year manufacturers warrantyProduct Description: Product description The easy to use 4 Way Locking system allows you to control the movement of your Cat without supervision, giving your Cats the independence you will both love. Setting the Pet Door to fully locked or out only also prevents strays or unwanted animals from getting inside. Able to endure the most energetic of Pets, the impact resistant Plastic design ensures the Cat Flap is Sturdy, Resilient and Long Lasting.  With possible installation in wood, glass, PVC, metal and brick, the 4 Way Locking Cat flap is available in a White, Grey or Woodgrain for a sleek looking finish. Important Information For Cats up to 7 kg Frame dimensions 252 mm X 241 mm Flap size: 130 mm X 156 mm Cutout dimensions: 175 mm x 168 mm Using the provided Tunnel Extension the Pet Door can be fitted into Doors up to 48 mm thick, with additional Extension available online For installations into thicker Doors and Walls additional Tunnel Extensions can be purchased What’s in the box 1 X PetSafe Staywell 4 Way Locking Deluxe Manual Cat Flap 1 X Installation Guide 1 X Cutting template If you have any questions please contact the PetSafe customer service team on 0800 046 1414.