I am getting ready to replace my countertops, sink & faucet in the kitchen. My current sink has what I refer to as a breaker which I thought was for the dishwasher. When I look at new products, installation videos, etc, I never see any reference to this. Is this breaker really for the dishwasher and is it needed. Most sinks that I look at have 4 holes and the faucets come with sprayers and soap dispensers which use them all.