We carry Autotrol Valve Discs for 255 part #1000250. This Valve disk or sometimes known as a flapper set, replaces the worn out set in a leaking 255 Softener Valve.
Replace these valve discs by removing the screws holding the top plate down. Remove the cam and the timer housing first. Then the flat springs will pop out of the top of the valve discs. Use a pair of needle nose pliers to help remove the springs and when finished, put them back. Use them to pull the valves out of the valve body. Installation is quick and easy.