Ideal Standard Type 290 Dual Flush Cistern Push Button Chrome SV21067 by Geberit

GEBERIT TYPE 290 DUAL FLUSH BUTTON. Manufactured by Geberit to suit the Impuls290 flush valve or SV20967 by Ideal Standard. The button simply screws into the valve to secure the cistern lid. Push Buttons are specific to the manufacturer and the corresponding flush valve it is designed for regardless to if it 'looks similar’.

eBay