Sigma ProConnex copper alloy ground clamp for 1/2 to 1 in. pipe. A ground clamp bonds the grounding electrode conductor to a water pipe or ground rod, and the two things that decide whether it is the right part are the pipe size range and the metal. Copper alloy is what goes on copper pipe; putting a dissimilar metal clamp on copper sets up galvanic corrosion at exactly the connection you need to stay intact. The clamp has to be listed for direct burial if it is going below grade, and the connection has to be accessible, which rules out burying it behind finished wall.
