Do I need any additional accessories to install the cat flap in a metal door or wall?
Yes, installing the cat flap in a door containing metal or in a wall requires an Installation Adaptor, which is sold separately. For wall installations, Extension Tunnels may also need to be purchased to ensure the flap extends completely through the wall. (Page 5)
From the official Petsafe Ppa44 16427 Microchip Cat Flap manual, page 5
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