Bestter round dual flush push button. This high quality Bestter push button is a direct replacement for your current button. If the hole in the top of your cistern is between 39-45mm diameter, then this button will fit in it. Note, the distance between the centers of the acutator rods is 20mm. Rods end around 220mm below the cistern lid but can be cut down to any size shorter than that quite easily.