Typical Cause
Leaks are often caused by a scratched o-ring or grommet on the cartridge. On models that use a handle mechanism, a broken part could also be the cause.
Solution
Replace the cartridge (on one-handle models) or cartridges (on two-handle models). It is essential that the model of the unit be identified to ensure you are replacing the proper cartridge. Please view our Find Your Product section to determine your model and the cartridge(s) required. After determining the model, you can view step-by-step instructions in our Animated Installation Help section.
If the faucet uses a handle mechanism, inspect the parts. If one of these items is broken, the handle mechanism will need to be replaced. Please view our Find Your Product section to determine which handle mechanism your model uses.
Note: Improper installation of the handle mechanism can also cause this to occur.