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Your ducting ^^^ would be 150mm internal. Slip it over a connector which would give you 150mm external.
https://www.screwfix.com/p/manrose-round-connector-white-150mm/145gy
user69121
@CYOA
On the subject of ducting again - I picked up these despite reading reviews that though advertised as 150mm, they come out as 160mm. They do indeed come out at 160+mm.
https://www.screwfix.com/p/manrose-aluminium-laminated-flexible-ducting-hose-silver-10m-x-152mm/86676
https://www.screwfix.com/p/manrose-extractor-fan-wall-fixing-kit-150mm/12523
Are you just supposed to squish them into place? That doesn't seem correct but happy to be told otherwise before I return them. Where can I get actual 150mm ducting?