%20(1).jpg){kind=small}
Replacing an Existing Cat FlapUpdated 8 days ago
Already have a cat flap and want to upgrade to Flappie? In many cases, your existing hole can be reused — depending on its size and shape.
Glass installations (circular hole)
Flappie fits into circular glass holes between Ø 212 and 260 mm. Here's how common cat flap brands compare:
| Previous cat flap | Typical hole diameter | Compatible with Flappie? |
|---|---|---|
| SureFlap Microchip Cat Flap | ~212 mm | Yes — direct fit ✓ |
| SureFlap DualScan | ~212 mm | Yes — direct fit ✓ |
| SureFlap Microchip Pet Door (large) | ~262 mm | No — > 260 mm, new glass needed ✗ |
| PetSafe Microchip Cat Flap | ~212 mm | Yes — direct fit ✓ |
| PetSafe Petporte Smart Flap | ~250 mm | Yes — with mounting adapter ✓ |
| Older/generic cat flaps | varies | Measure your hole and check below |
Quick rule: Measure your existing hole. If it's between 212 and 215 mm, Flappie fits directly. Between 215 and 260 mm, you need a mounting adapter →. Smaller than 212 mm or larger than 260 mm means the glass needs to be replaced.
Door/wall installations (rectangular hole)
For rectangular cut-outs, Flappie accepts existing holes up to a maximum of 175 mm (W) × 210 mm (H). If your existing cut-out is within this range, you can use it directly. If it's significantly larger, you'll need to reduce the opening (e.g., with wood filler or an insert panel). For a new cut-out, we recommend 166 mm (W) × 170 mm (H).
There is no mounting adapter for rectangular openings — it is designed for circular glass cut-outs only.
What about the tunnel?
If you're replacing a cat flap in a wall, you'll likely already have a tunnel through the wall. You can't reuse the old tunnel — but the hole itself should work. You'll need Flappie's own tunnel extensions → for the correct depth.
Not sure?
Take a photo of your current installation and measure the hole diameter (for glass) or height and width (for doors/walls). Send it to [email protected] and we'll tell you exactly what you need.
Questions? Write to [email protected] or use the chat in the bottom right — we're happy to help.