The Monument 339C Stopcock Key is a crutch pattern tool designed for operating external mains water stopcocks that are difficult to access. This essential plumbing tool enables plumbers and water engineers to turn on and off 1/2 inch, 5/8 inch and 3/4 inch crutch stopcocks, particularly those located in underground chambers or valve boxes. Measuring 1070mm in length, this tapered stopcock key provides the necessary reach to access stopcocks situated below ground level without requiring entry into confined spaces. The extended length allows comfortable operation whilst standing at ground level, improving both efficiency and safety during maintenance work. The turning handle incorporates a practical chisel end specifically designed for lifting inspection covers and manhole lids, eliminating the need for carrying additional tools. The painted finish provides protection against corrosion in wet conditions commonly encountered when working with external water supplies. Features and Benefits