Specifically designed for use on high efficiency 1.2 and 1.6 gallon per flush toilets. 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. Unplug your toilet with the GT Water Products Master Plunger, which features a long funnel nose for effective use. With a 1/4 turn of the air relief valve, you can prevent the overflow of the toilet or sink.