PetSafe Deluxe Cat Flap Tunnel Extension

The PetSafe Deluxe Cat Flap Tunnel Extension Fits Staywell 300, 400 & 500 series cat flaps. Clip-on section gives 1 7/8"" extra tunnel length allowing the cat flap to be fitted to doors and walls of any depth. You can clip as many sections together as necessary to create a tunnel through any wall or door!