I’ve dealt with leaking under the sink before (in the kitchen). The issue now is the bedroom bathroom sink. I have two sinks and I’ve been only using one and not the other, so turned the unused sink’s stop valve to off . In preparation for family’s visit, I turned on the stop valve of the other aink. And I notice there was leaking. . Took a picture of my bathroom sink#2 underbelly.
From my kitchen sink experience the nut (#4) closest to the stop valve control was the culprit, so I just needed to tighten that nut while I had my channel lock bite on the nut labeled #2.
But with the bedroom sink #4 nut would not budge when I tried to tighten, while the channel lock grips on the copper pipe #1. I exerted a little more pressure and the whole stop valve assembly (2,3,4) turned clockwise. And it’s still leaking. So I turned #3 counter-clockwise so the whole stop valve assembly straightens up again. Then I turned off the valve and it seemingly stopped leaking. It’s been 10 minutes since I turned off the valve and it has not been leaking (I put a thick cardboard right below it to see if there are water drops on it.
Appreciate you guys’ help on how to stop the leak in the meantime. Will try to replace the stop valve after they leave.