Sink plungers will have a rubber cup at the end of a straight handle. This plunger is good for sinks both in bathrooms and kitchens but can also be used in bathtubs. This type of plunger works well on a flat surface where the cup can lay flat over the drain and create the vacuum necessary to properly dislodge the clog. It doesn’t work well for toilet clog since it often cannot get a proper seal to create suction.