An actual duct that will fit a 127mm hole

5 Nov 2010
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United Kingdom
I want to buy this
to fit a vent for a cooker hood extractor and was going to buy something like this
because it's 125mm so should fit in a 127mm hole right?

But reviewers are stating it's not 125mm but larger and I've found a lot of other products like this too.

Can anyone actually point me to some products where they know will go into a 127mm hole for an extractor that is for 125mm ducting so that I don't find myself scratching my head?

Thanks very much and hope you can help.
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if you read the reviews for the cooker hood kit, someone says "The erbauer 127mm core drill is perfect for the job if used with the plastic tube - the metal flexi-tube will not fit."
Thanks for your reply.
I read that so basically there's no point buying this kit but buy separate items instead?
I can see a plastic tube on Screwfix with a 125mm external diameter but 350mm in length, so would the length be still fine for a double cavity wall?
Thanks again.
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