The Seachem Slanted Diffuser is a highly effective way to disperse CO2 throughout your aquatic system. The pollen-style diffuser is compatible with 6 mm (1/4") standard airline tubing and connects directly to CO2 injection systems. The sleek, low profile unit helps to minimize visual distractions within the tank and boasts a 15 mm surface area disc that provides diffusion for large volumes of CO2 gases, providing mid-sized and higher growth aquaria with the CO2 that they need to remain healthy and functional. Suction cups included with the unit. Well suited for aquariums between 20-60 gallons.