This kind of product is suitable for one-piece toilet. -It is combined of hydraulic fill valve and mechanical flush valve -Dual Push Button (Optional 38mm/ 48mm /58mm) -Half flush volume adjustable -Full flush volume adjustable -The height of flush valve is optional (from 0 node to 7 nodes: the height of every node is 25mm) -Highly adaptable:suitable for all kinds of toilets -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 pressure. -Durable:a patented hydraulic valve technology adopted. -High 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 Inner: Plastic Bag / Outer: Carton