Royal single flush push button from Thomas Dudley is recommended for use with the Pinto and Niagara Pneumatic single flush valves. The front of the button features a simple, elegant design in a beautiful chrome finish. The button is also ideal for both bathroom furniture such as WC units with concealed cisterns, and in wall installations. The button features an easy clean design for additional hygiene and is ideal for high traffic areas with its reliable Pneumatic mechanism which should ensure that this button stands the test of time. This button requires a 36 mm hole.