Why does a 3/8" bush cistern lever actually measure 6/8" in diameter? | General DIY Plumbing Forum | Plumbers Forums

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Why does a 3/8" bush cistern lever actually measure 6/8" in diameter?

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Discuss Why does a 3/8" bush cistern lever actually measure 6/8" in diameter? in the General DIY Plumbing Forum area at Plumbers Forums

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It may be due to when the pipe sizes were determined (steel pipe) the internal bore of the pipe decided the pipe size.
Most, if not all steel pipe is measured ID.
So you have the wall thickness of the pipe which determined the thread size.
 
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