Sureflap Tunnel Extender
SureFlap tunnel extenders can be used when installing SureFlap in a wall. Each tunnel extender adds 50mm (2") to the length of the tunnel and the tunnel extenders can be stacked together to create a tunnel of any length. SureFlap's existing tunnel is 70mm (2.75") long.
For more information on sizing, please visit the SureFlap website: