Plunging is an effective way to open a clogged drain. It’s important to know that there are two types of plungers. The kind with a steep black cup is a toilet plunger. The red plungers with a shallow cup are designed for opening sink and tub drains. Make sure there is water covering the drain. Place the plunger cup over the drain and push down until the plunger makes a good vacuum seal over the drain. Then grasp the handle and pump the plunger cup up and down quickly five or six times. Pull backward and see if the drain opens. Repeat the process until the clog is forced out and the drain opens.