Aqueon Aqueon Aquarium Water Changer is a convenient and easy-to-use tool for cleaning your aquarium and changing the water. It comes with a 20' extension kit with a splash-reducing guard, a gravel tube with built-in water flow control valve, and 25' of flexible grey tubing forgrass, plants and vegetation. The water flow can be adjusted to minimize water usage, and the gravel tube valve can be closed to completely stop the water flow at any time. The water changer also includes a sink attachment for easy draining of waste water.