JBL ClipSafe is a needful thing for water changing. It fixes the hose on the aquarium or bucket, two free hands for working are the result. Content: 2 pieces hose clamp for hose 12/16 mm. The clips have a stable locking mechanism (ratchet) for variable adjustment to hose diameters of 9-27 mm.JBL ClipSafe vario+ attach aquarium hoses, e.g. when changing the water, simply and securely to the aquarium edge and bucket+ easy to use: simply push the plastic clip onto the aquarium and bucket edges. Push the hose into the clips when not in use or to prevent it from accidentally slipping out+ safe: prevents flooding and wet floors caused by uncontrolled movements of the hose+ clamp for hoses between 9 and 27 mm adjustable by ratchet+ clamp on pane/bucket for max. 2.5 cm approx.+ package contents: 2 tube hose clips (9-27mm) + 2 foam pads for pane protection