The Mansfield 630-7984 is one of the last replacement parts made for the older 08, and 88 ballcock assembly fill valves. The ballcock assembly fill valve has a large balloon style float connected by a metal rod. If you are having a leak, or a groaning sound coming from the cap of the fill valve this repair kit should fix the issue. Before replacing the seals you can try removing the seals, and cleaning them with a soft dish cloth, and a mild soap.
