I'm after some gal water pipe, you know, the stuff they used to us in houses 50 years ago

I'm making a sprinkler system so need to be able to thread the ends for bspt(?) fittings

Does anyone have a chart or know the nominal bore and wall thickness for say 1/2" 3/4" and 1" water pipe?(ok so I guess the nominal bore is 1/2", 3/4" and 1" but you never know with the brits)

Google let me down, but maybe I'm just having a bad day.

Thank you


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