About 1' above my gas water heater on the cold water inlet is a T that goes from 3/4" copper (cold in) to 1/2" copper. This 1/2" elbows back up 90 deg. to a brass T. The top of the brass T is capped with a threaded fitting. The side of the brass T goes to a 1/2" pvc that elbows back down approximately 3-4' and then elbows back into the wall and out the siding of my house where it terminates in an open 90 deg elbow pointed toward the ground approximately 3' off the ground. I'm about to replace my water heater myself and install a thermal expansion tank and I would really like to know what this extra piping is.
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