• Dual function. Allows you to clean your aquarium gravel and change water at the same time. Convenient and saves time • Specially designed funnel head that effectively suck up dirt from bottom of the gravel bed • Flattened funnel head enables you to reach the edges and corner of the aquarium tank • Controllable ball valve enables you to select your desired flow rate with ease • Elongated vacuum body allows for easy grip and better control while cleaning your gravel • Adjustable water hose clamp enables you to attach the water hose to your aquarium tank while doing your water change