Fixing a Leaky Floatcup Assembly

Adjust the tank ball (or flapper) so it is directly over the flush valve. The tank ball has a guide arm that can be loosened so that the tank ball can be repositioned. Some tank balls have a ball guide that helps seat the tank ball into the flush valve. Make sure these parts are lined up and working smoothly. Turn off the water, and flush toilet to empty tank.

Replace the tank ball if it is cracked or worn. Tank balls have a threaded fitting that screws onto the lift wire. Clean the opening of the flush valve using emery cloth (for brass valves) or a scrub pad (for plastic valves).