SureFlapTM is supplied with fixings for a range of different thickness doors up to ~5cm. It can also be fixed into thicker doors and walls but should still be screwed into place from the outside face of the door/wall.
We recommend using the SureFlap mounting adaptor and tunnel extender accessories to mount SureFlap in a wall.
Full wall mounting instructions can be found on pages 9 and 10 of the user manual.
Manual: