VIV Spiral Pipe Outflow: http://goo.gl/K94hJM
The VIV Spiral pipe outflow creates great oxygen exchange while agitating the water surface and moderate circulation within the aquarium. You can lower or rise your Spiral Outflow pipe for your ideal aquascape.
Made from high quality glass, the VIV Spiral pipe outflow creates an elegant looking experience while still being completely functional for your aquascape.
VIV Spiral pipe outflow 13mm is a glass output pipe suitable for external canister filters with a hose diameter of 13mm (approx. 1/2" ID). The 13mm pipe is suitable for an aquarium of 25 gallons or less.