For adapting a copper cylinder to accept an immersion water heater element.
Standard immersion heater 2-1/4 inch BSP thread.
The male part of the fitting that goes through the cylinder has a 2-1/4 inch BSP thread, this measures about 65.7mm diameter, so the hole in your cylinder will need to be a little bit bigger than that.
See BSPT link at bottom of page for more info on plumbing thread sizes.
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