The concertina plastic construction in the unique bellow design, which is different to a traditional plunger, ensures that you are pushing water and air at the blockage, which means more force can be used to clear debris. They are flexible and very effective at clearing blockages in all types of sink, basin, bath or toilet. For maximum effect ensure the bellows are at least half full with water. Use a back and forth motion to push and pull the blockage. With a tight seal the backwards motion will actually suck the water away from the blockage. There is a complete range of plungers in the buffalo range that work across multiple applications.