Thanks to the adjustable clip, our universal Hobby Tube Holder is useful for almost all commonly used aquarium tubes (8-22 mm). Simply hinge the holder to the aquarium rim or bucket, attach the tube to the clip and you're ready to start the water change. You save yourself the bothersome holding of the tube and keep your hands free for important tasks.Hobby Tube Holder+ adjustable universal tube holder for tubes with a diameter from 8-22 mm+ a must when changing the aquarium water+ holds your tube securely attached to the bucket or aquarium rim+ hands are feed for important tasks