Petsafe Big Cat Flap Guide D'installation page 11

Installation adapter (rubber gasket toward glass)
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Installation adapter (rubber gasket toward glass)
Interior frame
Glass
Screws
Exterior frame
To install the cat flap in the cut opening:
Fit an installation adaptor onto the back of the interior frame and then insert it into the cut opening on the interior side of the
glass. The rubber gasket on the installation adaptor should face the glass. Have a helper hold the interior frame in place while
you go to the exterior side of the glass.
Fit an installation adaptor onto the back of the exterior frame and then fit it onto the tunnel of the interior frame. The rubber
gasket on the installation adaptor should face the glass.
Holding both frames in place, insert 51 mm (2-inch) screws (provided with the installation adaptors) through the holes in the
exterior frame, through the cut opening, and into the holes on the back of the interior frame. Make sure the cat flap is level in
the opening and then tighten the screws with a manual Phillips screwdriver. Do not over-tighten.
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