PetSafe Staywell, 900 Series Extension Tunnel, 18 mm, Easy Install, 1 Count (Pack of 1)

PRECISE INSTALLATION - Each 900 Series Extension Tunnel adds 18 mm to your Cat Flap, ensuring a flush accurate finish, even in thicker Walls UNIVERSAL FITTING Whether your Cat Flap is fitted into PVC, Metal, Glass or Brick, the 900 series Extension Tunnel aids a quick and easy installation THICKER WALLS - Using Multiple Tunnel Extensions together your Cat Flap can be installed into any depth of Wall or Door EASY ATTACH - When fitting multiple Extensions for deeper walls, each Tunnel piece simply clips together with no glue or screws needed. COMPATIBILITY - The 900 Series Tunnel extension is compatible with the Staywell Classic Manual 4-Wayay Locking Cat Flap (models 919EF and 919SGIFD only)