The wrench is used as an auxiliary tool for the disassembly and assembly of Runxin control valve components. It consists of a handle, in the center of which there is a socket for one of the valve elements with minimal clearance. At each end of the valve there is a socket — one for a larger element and one for a smaller one. Using this wrench, nuts on the drain line, raw water inlet, and treated water outlet can be loosened and tightened.