What are the dimensions of OnlyCat?

Check the current installation guide before cutting

Use the maintained Dimensions & Specs, door, wall or glass installation guide. Confirm the opening, material and adaptor before making permanent changes.

OnlyCat’s external tunnel measures 165 × 172 mm (width × height). This is a product measurement: for the opening to cut, use the supplied frame or printable template and the current guide for your installation. The standard glass mounting adaptor suits a 212–260 mm circular cutout; larger existing openings require confirmation of the appropriate mounting accessory.

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: 05/10/2026