THOMAS DUDLEY NIAGARA FLUSH VALVE. WHETHER YOU REQUIRE A SINGLE FLUSH VERSION OR A DUAL FLUSH VERSION, THIS ITEM WILL NOW FIT BOTH TYPES. SO IF YOUR REPLACEMENT PRODUCT CODE IS EITHER 316723 FOR THE DUAL FLUSH OR 314306 FOR THE SINGLE FLUSH, THIS IS THE PRODUCT YOU NEED. Uses Ideal for use as replacement flusf valves in most concealed cisterns and supplied as standard in Vantage, Miniflo and Royal cisterns. Features Bayonet fitting enables valve body to be simply removed from the cistern. Maintenance can then be carried out in minutes without disconnecting the water supply or dismantling the cistern. Long life silicon rubber seal. 51mm (2\”) outlet. WRAS approved. Water-saving Dual flush valves deliver 6 and 4 litre flushing. Single flush is 6 litres.