Dripping occurs when the faucet is closed; water leakage occurs when water flows through the faucet. If you see water pouring from around the handle, your faucet is leaking; the first thing to do is to make sure that the packing nut of the faucet is tight, but be careful not to scratch the nut with pliers or a wrench.
Tools needed when replacing the faucet sealing ring: adjustable wrench, replacement faucet sealing ring, petroleum jelly. If you find that the cause of the water leakage is not the loose nut, then you need to replace the sealing ring.
The sealing ring of the faucet can be a tight sealing ring composed of one or more O-shaped rubber rings, or something like a string or soft metal wire wound on the valve core under a packing nut.
When replacing the faucet sealing ring, follow the steps below:
1. Turn off the water supply and remove the faucet handle.
2. Unscrew the packing nut, and remove both the nut and the old sealing ring from the valve core.
3. Install a new sealing ring. If you are using a linear sealing material, wrap it around the valve core a few times. If it is a sealing material such as a soft metal wire, only wrap around the valve core once. Before you assemble the faucet from scratch, apply a thin layer of petroleum jelly to the threads of the valve core and packing nut.