model:s-yy-ft-2212 -water saving: volume of water can be adjusted according to different types of toilets, such as water intake volume, water discharge volume, water refill volume, etc -fixed water intake & discharge volume and the product performs equally well without being influenced by the change of hydraulic presssure. -durable: a patented hydraulic valve technology adopted. -hight water discharge volume: 2.2-2.5l/s -the push button is easy to operate just like the mouse action. - easy installation -anti-siphon, quick intake, however, the intake noise is less than 48db -suitable for poor water quality, eg, seawater