Clogs are cleared with plungers through the process of water displacement. The more water pushed towards the clog per plunge determines the ability of the plunger. Standard designed rubber cup plungers displace about 2 to 4 cups of water per plunge. The bellows design Master Plunger displaces between 8 to 10 cups per plunge, depending on the model. The universal design of the GT Water Products Black Master Plunger helps you blast clogs down the drain with the funnel nose. The bellows-style polyethylene head delivers plenty of power per push and the pommel top handle lets you maintain a sturdy grip as you unclog your sink or toilet.