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yetidamo
hey! we just did the same. We have a sureflap microchip cat flap and you buy these tunnel extenders, builder just told us how many we needed - 4 plus the flap :)
https://fetch.co.uk/sureflap-cat-flap-tunnel-extender-white-296479011?gclid=CjwKCAjw-qeFBhAsEiwA2G7Nl2FIpEizzZKZciq1SDU6LlwVeGY8Wyqa0wwfuXpaIm1LpdYRVWr7LxoCJ7sQAvD_BwE&gclsrc=aw.ds