Abstract: A tool may eliminate over 90%, typically over 95% of the hammering needed to open or close a hammer union. Typically, to open or close a hammer union, a worker needs to swing a heavy hammer at a small tab on the hammer union. This conventional process may result in injury to the worker. The tool of the present invention may have a tool head designed to fit onto a hammer union. A handle of the tool, extending from the tool head, may be used to provide rotational torque to the hammer union.