What are the dimensions of OnlyCat?

OnlyCat is designed to be a drop-in upgrade for most existing cat flaps (including the SureFlap Cat Flap). It requires a minimum opening size of 165 mm x 172 mm, or a 212mm (or larger) round hole.

For larger existing cutouts, such as those with a SureFlap Pet Door, we offer three large mounting accessories (Large Round, Large Square, and Large Squircle) to convert to OnlyCat.

For more detailed specifications, please visit our Dimensions & Specs page.

Updated on: 15/09/2025