(the flange) around the cup. The flange is inserted into the toilet drain, sealing in the air and increasing the suction power. In a pinch, you can fold the rubber ring back into the bell of the plunger and use it to unclog a tub or sink drain, but a true cup plunger will be ...
This led to international interest in the design. Most modern dual flush toilets use less than a gallon of water (3 liters, approximately) to flush liquid waste and around 1.6 gallons (6 liters) to flush solid waste [source: Nash]. This is a big savings over old toilet styles that ...