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How does a concertina plunger work?

Shop for Plungers

Plunger should be at least half submerged in water Concertina plungers work by a build-up of water pressure, which is drawn into the body of the plunger by the bellows. When plunging the plunger, at least half the cup should be submerged in water.
When putting the plunger in to the water, angle the entry When the plunger is placed into the water at an angle, the water replaces any trapped air, forcing it out of the cup.
Water is forced down the drain aganist the blockage When the handle is pressed down into the body, it forces the water in the cup of the plunger down the drain, and against the blockage.
When putting the plunger in to the water, angle the entry As the handle is pulled back, it creates a space, which the drawn water promptly fills.
Water is forced downwards, Breaking up the blockage and forcing it down the drain As the water is drawn up into the bellows, the water movement created in the pipe helps to break up the blockage.
Water is forced downwards, breaking up the blockage and forcing it down the drain The handle is then forced back down, compressing the bellows, forcing the water back down the drain, pushing and flushing the blockage away.