The multi-purpose coupling wrench is a type of multi-purpose wrench that was presented and registered for the first time by Ariakupling. This wrench is used to open and close all types of German couplings (STORZ), barrel lids, and open and close the five-pin screw of stand-up fire fighting valves. In this way, instead of carrying and moving several wrenches, you can carry only one light and strong wrench. The use of a layer of strong steel sheet between the compressed plastic body of the wrench has made this product more durable to impact. The industrial design of this product named Ariakupling has been registered.