Some plumbing problems definitely call for pro-grade expertise, but fixing a water shut-off valve leak isn’t one of them.
Tighten the packing nut on the toilet shutoff valve one-eighth turn clockwise to try to seal a leak around the nut. Pro tip: Wrap cloth or masking tape on the plier’s jaws to protect the nut’s finish.
We’ve all been there: a leaky faucet that you keep meaning to fix, or that strange gurgling sound coming from the toilet that ...