When you buy galvanised conduit (20mm, 25mm, 32mm etc) is the dimension internal or external ? Cheers, Simon.
galv conduit dimensions
Aug 27, 2010
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Information here may be outdated?
It is the outside diameter. ISTR that the wall thickness is 1.6mm on the 20 and 25mm stuff. I cannot recall ever using the 32mm stuff.
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