The mechanism that is fitted and used on the WC pan to flush, uses a valve and is quite easily installed. This provides a reliable and modern flush control and is normally operated by push button. These arrangements do vary and there are many designs available. Should you need to replace an existing flush but are not too confident to do the job, you really need call a professional plumbing service Orpington Plumbers who can fit dual flush systems in any home and also make sure the work is carried out to a high standard.Firstly, you should isolate the water supply completely, and using the flush, empty the last of the water from the WC cistern. Remove the cistern lid and then take out the ball valve that sits inside, now take off the handle with flushing mechanism. Take the cistern from the wall and clean out all the grime and dirt using old cloths or rags. Unscrew the wing nuts fitted under the panel and remove the filling valve. An Orpington Plumber can work on flushing mechanisms.Connect the flush cable control to the ball float mechanism, normally with a clip and then connect it to the bottom of the cistern with the back-nut and grommet that is usually supplied. Adjust the filter restrictor, which is normally dependent on the water supply, either at mains pressure or fed from a cylinder. Locate the filter restrictor into the threaded tail of the filling valve and connect the filling valve to the inlet pipework using the back nut and washer supplied. Press the flush cable control to the flushing button, fix the button using the back nut supplied. Refit the cistern and reconnect to the WC pan. Refit the tap connector that joins the water inlet pipe to the filling valve. Turn the water supply back on, and monitor the cistern to make sure there is no leaking and the flush operates in the correct way.“