With a simple wave of the hand, hygienic, contactless flushing is now here for close coupled WCs. Two sizes are available depending on the size of the flush button hole in the cistern lid. Serenity systems require flush button kit TR9032 The button kits have been designed to retro-fit to existing WCs which have paddle operated flush valves. For cisterns which have pneumatic or cable operated flush valves, or where the button screws in directly to the flush valve, then the flush valve will also need to be swapped to our TR9033 valve which has a 2" base