Lily pipe consists of 2 major parts: the inflow and the outflow pipe. These pipes are used to increase the water movement in lower parts of the aquarium where water can easily become stagnant and at the same time aerates and prevents the accumulation of oil on the water surface with a simple whirlpool; without causing excessive waste of CO2 gas. Powerful flow rates are usually used to create strong currents. The feature of the lily pipe is the creation of a powerful flow rate for stronger currents without disturbing the aquascape within an aquarium. These are great for the flora and fauna that prefer high flowing currents. Despite the strong flow being created powerful flowrates are still suitable for the growth of aquatic plants. Dymax Crystal Lily Pipe is a set of inflow and outflow pipes made of high quality quartz glass that provides a superb clarity to its appearance as well as durability. The material is insensitive to temperature and will remain at its shape whether the aquarium water is heated or chilled. Quartz glass is durable and hardwearing so the pipes are not easily scratched or damaged. Each part of the product is handmade using latest technology and highest quality selection through strict quality control. Outlet Pipe: 17.5cm. Outlet Pipe Width: 17cm. Outlet Cup Size: 6.8cm. Inlet Pipe: 20cm. U Pipe size: 8cm. U Pipe Spacing: 4cm. Total Inlet Pipe Size: 30cm. Outlet Diameter: 1.65cm.