1、HIGH DENSITY: Aquarium nano air disc, high density refinement of oxygen, ultra micro nano, uniform air output. Suitable for most aquariums and fish tanks. 2、OXYGENATION: High dissolved oxygen, to ensure the oxygen content in the fish tank, to ensure that the fish have sufficient oxygen to breathe. 3、WASHABLE AND REUSABLE: Fish tank nano air disc is easy to clean, can be used for many times for a long time, environmentally friendly and durable. 4、SAFE MATERIAL: This aquarium nano bubble disc is made of harmless material sintered by high temperature, it will not affect the environment inside the fish tank. 5、ADJUSTABLE: The atomized fish tank bubble disc comes with an adjustment valve to adjust the amount of oxygenation to meet different usage environments. Item Type: Aquarium Nano Air Disc Material: Plastic Disc Size: Approx. 5cm / 2.0in Applicable Fish Tank Size: Approx. 50-120cm / 19.7-47.2in 1 x Aquarium Nano Air Disc 1 x Check Valve 1 x Suction Cup 1 x Control Valve