If you still can’t find a way to shut off the lines directly, use the main water line valve. It’s where the water line enters your house and will either be on the inside or outside. It’s usually by the water heater and has a red handle. If you have city water, look for the valve near the water meter by the usage gauge. You can turn it off with an adjustable wrench. If you have well water, the valve by the pump can be turned off by hand. The water utility company can also help you shut off the water supply. If the water hasn’t been turned off in some time, these valves may start to leak. If this happens you’ll need to replace the valves yourself or hire a professional. [3] X Expert Source Allen LeeHome Improvement Specialist Expert Interview. 10 July 2020.

If your pipes are made of copper, hold the copper lines to prevent them from twisting or breaking while you remove the supply lines. Try to keep all the parts together in a safe spot, such as inside a bucket. Label the parts with tape as needed so reconnecting them later is easier.

If your disposal is hardwired, turn off the electrical supply to it (and your entire kitchen if necessary) at your main circuit panel. Even if you have a plug-in disposal, it’s best to shut off the power to the outlet in the sink cabinet since there will be water dripping from disconnected pipes.

If the pipes and fittings are plastic, loosen them by hand to avoid damaging the plastic with pliers. Remember to place a bucket under the pipes. Leftover water will spill out of them.

For more instructions on removing the garbage disposal unit, consult your owner’s manual or search the manufacturer’s website.

Also wash any parts you’ll use when installing your new sink, such as the faucets or drains. If the sink is made of a particularly heavy material, have a friend help you lift it. [10] X Expert Source Allen LeeHome Improvement Specialist Expert Interview. 10 July 2020.

To fit a larger sink, flip the sink upside down over the hole and trace the outline. Then, cut the countertop to size with a jigsaw, router, or other cutting tool. To purchase the right size of sink, measure the length and width of your old sink.

Wipe away the excess caulk with a rag.

Packs of sink clips can be purchased at any home improvement store. You can use your old clips as long as they’re not rusty and still clip on tightly.

You can also use a mounting strap instead of bar clamps. Run the straps through the drain and clamp them together beneath the sink.

When using caulk remover, check the packaging for a recommendation on how long to let the remover soak into the caulk.

The sink has to be lowered slowly and taken out through the cabinet.

You’ll need a helper to hold the sink while you secure the clips from underneath. Or, to create more room below, have them hold the sink while you reattach the 2x4 and clamp from the sink removal, which will hold the sink in place while you work.

The clips should hold the sink in place, but you can prop a few wood blocks under it to make sure the caulking creates the best seal possible. You may reuse sink clips if they’re not rusted and appear to hold the sink tightly in place.

Make sure the sink is level and straight before tightening the lines.

These parts come packaged with the drain, although you can always purchase them separately.

Read your owner’s manual or search the manufacturer’s website for more information on how to install the garbage disposal.

Don’t forget to turn on the garbage disposal’s electrical supply. Plug it into the outlet and give it a test run.