PRECISE FITTING - The Staywell 700 Series tunnel extensions can be trimmed for an exact fit into your door or wall.
THICKER DOORS – The Tunnel Extension adds 50.8 mm allowing them to be installed into thicker doors and walls
EASY INSTALL – Simply trim the 4 pieces to the depth of your door and connect the pieces together
CLIP SYSTEM - Each piece of the Tunnel Extension Easily clasps together for a firm and secure hold that doesn’t require any glue or additional screws
COMPATABILITY - The Staywell Tunnel Extension is compatible with all 700 Series Small Pet Doors
PetSafe Staywell Original 2-Way Pet Door Tunnel Extension Small Grey B003TL3YLY