I have an old clawfoot tub in which I installed this shower conversion setup
several years ago. The faucet started dripping after a few years, which slowly turned into a constant stream, so I ordered a new faucet
and brought in a plumber friend. He replaced some of the supply lines and added shutoff valves to both the hot and cold water. We tested the shutoffs before installing the new faucet and they work perfectly.
But now that a couple weeks have gone by, the new faucet has a nice steady drip. What's strange is that with both the hot and cold shutoffs completely closed, the drip continues. I figured maybe it was just dripping water leftover in the riser pipe, so I lifted the lever that turns the shower on so that any water from the riser could drain out. I dropped the lever and left it sit with the supply shutoff valves turned off for 24 hours, came back, and the faucet still had a steady drip.
Where is this water coming from? I confirmed that I get no water with the faucet on and the shutoff valves closed (except for the same drip), so I'm a bit confused. And it's a brand new faucet, so is it possible it's already broken internally? And if so, can I fix it or do I need a new faucet?