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not according to my google for 16mm metal conduit
https://www.cef.co.uk/catalogue/products/1780443-16mm-galvanised-steel-flexible-conduit-10m-reel -
16mm rigid steel conduit used to be a thing, but I think you'd struggle to find it these days. Unless you have some weird use case, it's easier to stick to 20mm minimum, which is presumably why 16mm went out of fashion.
duncs
gbj_tester
@hugo7
Is 20mm the smallest sizing of galvanised metal conduit?
Cheers.