Fixes most leaks Includes most common replacement parts used to stop leaks coming from the base of the 2510/2510SXT valves. Slip Ring (Fleck part# 19197) Slip ring for Fleck 2510/2510SXT control valve . The slip ring holds the O-ring in place that seats against the mineral tank. If the slip ring is cracked or broken, water will leak out from between the tank and valve. Tank O-ring (Fleck part# 18303) O-ring for Fleck 2510 control valve that seats against the tank to create water-tight seal. If the tank O-ring is damaged or worn water will leak out from between the tank and valve. Base Seal (Fleck part#19936) Replacement seal that goes between the control head valve body and the adapter base. Worn or damaged base seal will allow water to leak from the clamp, and may appear to be leaking from between the tank and valve. Distributor O-ring (Fleck part# 13304) O-ring for Fleck 2510/2510SXT 1.05" distributor tube pilot. Damaged/worn distributor O-rings can allow untreated water to mix with the treated water. Distributor O-ring Retainer (Fleck part# 13030) Retainer that holds the distributor O-ring in place. Fits Fleck 2510/2510SXT with standard 1.05" distributor tube pilot. If broken or cracked this can prevent a proper seal for the distributor O-ring which can allow untreated water to mix with the treated water.