What are two common types of residential toilet tank mechanisms?

The correct answer highlights two widely recognized types of mechanisms used in residential toilet tanks: gravity-fed and pressure-assisted mechanisms.

Gravity-fed systems operate on the principle of gravity, where water from the tank falls into the bowl when the flush handle is activated. This mechanism typically includes a flapper or a valve that seals the opening during a flush, allowing for a reliable and straightforward function, making it a common choice for residential toilets.

On the other hand, pressure-assisted mechanisms use compressed air to force water into the bowl with more power than gravity-fed systems. This leads to a more efficient flush, using less water and providing a strong siphon action that helps to clear waste more effectively.

Both mechanisms are designed to enhance toilet performance and provide a reliable flushing action, catering to different consumer preferences regarding water usage and flushing efficiency.