I tried ordering 3/8 and got 1/4 instead so it can be used over time but not much. Will keep it but order the right size for my intended use. So the estimate isn't fair, but I've only done this to warn others to be sure of the size you're ordering. Size 3/8 standard. It appears to be a good tube, but what matters most is its durability, which cannot be measured when new.
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