Step 1 : Remove the old sink
Turn off the water. If you have shutoff valves on the supply lines going to the faucet, turn them off. If there are no shutoff valves, it's a good idea to install them because without them, you must turn off the water to the whole house while you're working on the sink.
If there is a garbage disposer, unplug it from the receptacle and use a screwdriver to loosen the screw or bolts that hold it in place. If it's hard-wired, turn off the electricity, and then disconnect the wiring.
Remove the water supply pipes leading from the wall to the faucet. Place a bucket under the p-trap to catch the water in the trap. Then loosen the compression nuts and remove the trap.
There are two types of sinks. A self-rimming sink is held in place by a built-in rim and a series of clips underneath the sink that secure it to the countertop. Use a screwdriver to loosen the clips and remove them. Then push up on the sink from underneath to break the seal between the sink and countertop.
The other type sink is called rimless or flush-mount and is held in place by a separate sink rim. This system also uses clips that not only hold the rim to the countertop, but also secures the sink to the mounting rim. Because the sink and rim are separate pieces, you usually find a series of tabs that keep the sink from falling through as you remove the clips. Before you loosen the clips on a rimless sink, make sure that the tabs are bent or that corner clips are installed.
With a nut driver or screwdriver, loosen the screws in the clips and begin removing them. Recheck that the sink is secure before you remove the last few clips. Then, lift the sink out of the opening. If it's too heavy to lift, as a cast iron sink may be, carefully lower it to the bottom of the cabinet or have someone help you lift it so that you can remove it from the kitchen.
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