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How to install a toilet handle
Lift the lid off of the toilet tank and make sure the tank is empty.
If the toilet has been in use previously, shut off the water supply to the toilet, then flush it to empty the tank. If this is a new toilet, do not turn on the water supply until after the handle is installed.
Hold the handle in your non-dominant hand and remove the gasket and shank nut from the back of the handle. The gasket is a rubber ring that sits behind the nut and helps to seal the handle from leaks.