Its best for sinks. Plungers With Flap (Flange Plunger ... allowing it to create a stronger seal when used on toilets. This design is specifically intended to deal with stubborn toilet clogs.

Elsewhere, a similar design is available in the Heavy Duty Toilet Plunger at Robert Dyas for £12.99. If a traditional cup-on-a-stick plunger is more to your liking, check out the Saber 5.5-Inch ...