Thomas Dudley Pushflo / Derwent Macdee Large Dome 91mm Pneumatic Single Flush Chrome Toilet Cistern Push Button 316562 Flush Valve but is easily identifiable due

but is easily identifiable due to it's unthreaded connection for the button on the top

Armitage Shanks

the washers are rubber and the cistern bolts are made of metal

Height: 318mm

or blue cap syphons from Macdee

Thomas Dudley Pushflo / Derwent Macdee Large Dome 91mm Pneumatic Single Flush Chrome Toilet Cistern Push Button 316562 Flush Valve but is easily identifiable dueThe large dome single flush push button from Thomas Dudley is recommended for use with Thomas Dudley Pinto Derwent Macdee Compact and Thomas Dudley Niagara pneumatic 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