This Home & Garden video shows you how to replace a running old style fill valve toilet with something more modern. Shut the supply line to the toilet and flush to remove the water from the tank. Then remove the supply line. Now take a wrench and loosen the plastic nut of the old fill valve located under the tank. Then lift the old valve and keep it aside. Take a 'flow master', which is a new type fill valve, place it in the same spot and hand tighten the nut under the tank to hold the flow master in place. Then attach the supply tube making sure the pipe has no kinks. Then connect the supply line and it is done.