Resists corrosion, saves water and replaces old-fashioned ballcocks. Fluidmaster toilet tank repair kit allows the D-I-Y handyman to replace old or worn parts. Durable bull's eye flapper installs easily for complete water shut-off after every flush. Aids in fixing leaking toilets with replacement flapper. New valve resists corrosion for a longer life. Replacement valve controls the amount of water needed to flush. Repair kit is consists of a replacement valve and a flapper to get toilet back to functioning properly.