You can use a basin wrench on any plumbing nuts that are hard to reach, like under your sink, or behind a toilet or appliance. Basin wrenches come with differently-sized jaws to fit around smaller or larger nuts. Get a basin wrench with a built-in light if the space underneath your sink is dark. That way, you’ll get a better view of the nuts without having to hold a flashlight.
If the jaws don’t fit tightly around the nut, then the wrench you’re using is too big. Get a basin wrench with a smaller set of jaws for your repairs.
If the jaws slip off of the nut when you try to turn it, then the jaws are positioned in the wrong direction. Flip the jaws so they point in the opposite direction and try turning the nut again. If the nut still won’t turn, try gripping the T-bar with a regular adjustable wrench to get more leverage.
Be sure not to use your faucet when you disconnect the P-trap since the water will spill out underneath your sink.
If you’re replacing the full faucet and can’t cut through the nut, you can actually saw through the faucet itself.
You can also place 2 coins on the sides of the nut and hold them tightly to improve your grip as you unscrew the nut by hand.
