The touchless flush valve can be  easily retrofitted to upgrade an existing  push button to an automatic flush  system.  Simply wave your hand to use. The valve  automatically detects the required flush  volume, whether full or half flush. Flushes can be adjusted easily to 6/4,  4.5/3 or 4/2 per dual flush settings. The touchless flush valve fits most toilet  cisterns with a 38mm cistern hole and  an external cistern height (including  the lid) of 360-390mm. Additionally,  the mechanism is battery-operated,  eliminating the need for a power  connection. Four alkaline batteries (not included) ensure more than 40,000 automatic flushes, minimising the frequency of battery changes. WRAS approved - Waterproof level IPX 6.