Tavistock Vortex Concealed Cistern Dual Flush Front Top Access WC Toilet Slim Slimline concealed cistern and round chrome dual flush push button Pre-assembled concealed cistern 3/6 litre adjustable flush options Pneumatic flush valve Push button operation Bottom entry inlet valve Top & front access High quality These cisterns are 20,000 cycle endurance tested Designed to work with low height furniture Depth only; 135mm, ideal for slimline furniture made from high density polythylene with polystyrene insulation jacket to prevent condensation 7 reduce re-filling noise Requires 0.2 - 10 bar working pressure range 90 degree flush pipe for neat installation