How to Turn Water off Under Sink
Sometimes the valves are underneath a layer of ancient gunk. Like a fossil. If you can’t turn them, do not force it. You might snap the pipe and create a geyser. A tiny DIY job becomes a $500 emergency.
Another fun one: some sinks have no shut-off valves at all. It’s just pipe going into the wall. In that case, you’ll need to shut off the main water line. Yes, the whole house. Sorry. This is when you call your landlord or a pro.
How to Turn Off Water Under Your Sink (Kitchen & Bathroom) | Checkatrade
If you have those weird plastic compression valves (the ones with a little knob), turn them slowly. They’re delicate. A quick twist can crack ’em. Then you’ll really have a problem.