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Type K has thickest wall. Example Only; 1/2 inch nominal size has a 5/8 outside diameter and a little over a half inch inside diameter 0.527-in. Type K wall is .049, Type L wall is .040 and Type M wall is .028. Thinner wall is of course easier to bend, but may not be as puncture resistant as thicker wall tubing. Copper tubing should only be used for propane (...

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