This versatile pneumatic flush button from Fluidmaster can be mounted in furniture or on the wall. The dual flush functionality offers water saving benefits, and the chrome plating gives a stylish finish. With easy tightening and fitting, this button can be used with Fluidmaster concealed pneumatic cisterns. This pneumatic button offers dual flush functionality and is compatible with the Fluidmaster concealed pneumatic cistern FTB13181. It fits into hole sizes of 72mm to 78mm. Please note: Not suitable for top action ceramic cistern lids (40mm hole).