The double trap siphonic toilet is a less common type that is exceptionally quiet when flushed. A device known as an aspirator uses the flow of water in a flush to pull air from the cavity between the two traps, reducing the air pressure inside and creating a siphon which pulls water and waste from the toilet bowl. Towards the end of the flush cycle the aspirator ceases being immersed in water, thus allowing air to enter the cavity between the traps and breaking the siphon, without the noise while the final flush water fills the pan.