Air brake/treadle valve holding tool Shley Products' specially designed holding tool, No. 67400, was manufactured to hold two treadle valves so that the attaching air pressure fittings can be exchanged from the old valve to the new valve. When holding the two valves side by side, the same exact angle of the pressure fitting can be attained. Some of these valves can have up to eight or more pressure lines with check valves. The tool has been blanchard ground flat and comes with attaching hardware.