The New Sangenic refill cassette fits all tubs*. The cassette has an advanced multi-layer, anti-bacterial film, which locks away germs and odours. The film keeps on killing germs even while the nappy is disposed of in the tub, for maximum hygiene protection. The cassette gives unbeatable odour protection. Twist-lock technology individually seals each nappy, locking away germs and odour. The system is scientifically proven to be 100 times more effective at odour prevention than nappy sacks. Just drop the cassette into the top of the tub and it's ready for use in seconds.