Check with your supplier, but I think that with copper you need to use "forged fitting" they are heavier than the regular fittings. Why not just use one trench and then if you need to do any digging in that area you could locate both the air and propane. I would go larger on the gas line if there is any chance if Natural gas coming to you area (I just switched to natural and found that NG takes larger pipe than LP)
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