Buffalo Concertina Toilet WC Plunger Unblocker Works on Blocked Drains & Loos. These plungers, sometimes known as suction plungers, are made of plastic and have a concertina construction. This allows a much larger volume of air or water displacement and is the most effective way of removing a blockage. The toilet plunger is designed specifically for fitting low down into the toilet U bend. With a narrow end it can also be used for difficult to access outdoor drains. Length Approx: 50cm. Usage Instructions: 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 blo.