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Originally Posted by Meethoss
Sorry, just going back to the original thought of why US typically uses 1/2" and why Europe uses smaller - I went to a plumbing shop recently and found that nothing was sold in 1/2" and instead was usually smaller. Maybe that's something to do with why we originally started down this route? (I might even be totally wrong, I was probably looking in the wrong section or something :P)
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You're right.
Lower flow rates don't warrant the use of 1/2" tubing: 3/8" is quite sufficient.
Here, state side, 1/2" fittings are more common (at least within my experience) read cheap, and aren't really an inconvenience to use.