I bought this to replace the 1/4" ID hose that is used for ozone. I originally ordered a 1/4" ID hose from another listing. This hose was closer to 5/8" and had to be sent back to Revain. I ordered 3/16" and expected it to be larger as well. The 3/16" size is perfect for the 1/4" size. It appears that metric tubing is actually larger than US inch diameter.
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