Wood and PVC/uPVC/Metal
Tunnel extension is suitable for the depth of most doors up to 50 mm (2”). Measure the depth of the hole cut in your door and cut the 4 tunnel pieces to this depth (X). Connect the 4 tunnel pieces together in a square shape as indicated and fix the tunnel onto the external frame (with flap) of the pet door. It is recommended that the tunnels be glued on to the frame and each other.
IMPORTANT: It is not possible to cut holes in toughened glass or double glazed units except at the time of manufacture. Please consult a glazier.
When fitting into glass the top tunnel piece cannot be used and the side tunnel pieces will need cutting down as indicated. Connect the 3 tunnel pieces together and fix the tunnel onto the external frame (with flap) of the pet door.