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Not much of anything. Drip legs were quite common in the past, and many cities and engineers still specifiy their use. They are intended to capture any condensed water that may have been transported in the gas. If you don't have a drip leg, I'd not worry about it. I was flagged for this in the Borough of Magnolia in NJ and had to install one to obtain a Certificate of Occupancy. You can call the township you live in to see if it is required.

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Q: What if there is no drip leg installed on a water heater gas line?
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