The EHEIM Green Hose with a outer diameter (OD) of 12/16mm and a roll length of 3meter is suitable for both freshwater and seawater aquarium setups. With dimensions of 16.5 cm in width, 6.6 cm in height, and 16.5 cm in depth, this hose provides versatility and convenience for various aquarium applications. Its durable construction ensures reliable performance and efficient water circulation within your aquarium system.