The Fluval GravelVAC is a comfortable gravel cleaner for all aquarium substrates. The water change is made simplier and faster. Thanks to the easy start siphon the sucking with the mouth is no longer needed. For an optimal cleaning result a flow regulator is included. With this regulator it is possible to control the water troughflow and the sucking power. With the extension tube you can use the Fluval GravelVAC for different aquarium heights. The bucket clip fasten the hose on the bucket.Fluval GravelVAC+ for aquariums 20-50 cm height, Hose size: 9/12, 15 cm extension tube+ for aquariums 20-60 cm height, Hose size: 16/22, 20 cm extension tube