Is probably occurring around the water valve stem.
Replace valve stem under sink.
The valve stem loses its rigidity once the main nut is removed and you can lift it out of the valve socket.
It s not uncommon for a brand new shut off valve to leak around the handle area whenever you turn it on.
How to fix a shutoff valve leak.
With a few household tool.
Removing the valve stem allows any remaining water to drain out making the unsweating process easier.
To tighten the new valve begin by applying some physical force.
The water valve stem passes through a packing nut and washer which provide a watertight seal.
Replacing a shut off valve compression valve or angle stop may seem like a daunting task but it really takes less than 5 minutes.
Step 4 installing a new bathroom sink valve.
The valve is only 10 years old so i assume this stem will fit without problems.
Knowing how to fix a leaky stem faucet saves money and the process is easy.
Now i have to fix the shut off valve before i can even attempt to replace the fill valve.
Hold the valve with a pliers loosen the packing nut and unscrew the entire valve stem.
A leaky stem faucet usually means that the packing is worn out or needs tightening.
The valve is on a short piece of pvc pipe not copper and i just can t attempt to replace the whole valve myself for this reason.
Peek inside and remove the old washer if it s stuck on the seat.