VIV produce a wide range of glass accessories for the aquarium, made from high quality, laboratory grade glass, with gives maximum strength, durability and visual clarity. The hand crafted glassware is designed to achieve the perfect blend of art and function that are highly transparent and almost invisible in the water. Ideal for giving a professional look to any planted aquarium. The Violet Glass series is designed to create water flows suitable for fish that prefer moderate water flow, such as cyprinids and characins in an aquatic plant layout. The large Violet out-flow Pipe has a 17mm diameter and is designed to be used as the water uptake from the tank to a canister. In addition, the outflow pipe provides aeration (original: produces an aerating effect) depending on its placement. Comes with suction cap to secure to side of aquarium.