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If you really want to try making it yourself, use 1/2" copper (OD is close to 5/8") and sweat (solder) a compression fitting ring on the end to act as a barb.
If you really want to try making it yourself, use 1/2" copper (OD is close to 5/8") and sweat (solder) a compression fitting ring on the end to act as a barb.