<--wysiwyg--> if your wirquin jolly fill or topy inlet valve won't shut off properly it could very well be that the diaphragm washer inside of the valve needs to be replaced over time as the valve is continuously opening and closing small tears can start to form in the diaphragm washer in turn the diaphragm washer will no longer give a good seal and debris in the water supply (which can be commonly caused by nearby work being carried out on the water supply) can also contribute overtime to this washer being worn.