The Fluval Mini Pressurized CO2 Kit is the ideal CO2 supplementation system for the Fluval Flora and other planted aquariums that are up to 15 gallons. It will ensure that the most important nutrients are available to plants to maintain vigorous, lush and vibrant growth and condition. The Fluval Mini Pressurized CO2 Kit is easy to use and will ensure your plants stay healthy and strong. The Fluval Pressurized CO2 Kit Features and Benefits:. - Ideal for use with the Fluval Flora Aquatic Plant Kit or other planted aquariums. - Kit Includes:. - Disposable 20g CO2 cartridge. - Regulator valve with gauge for the effective control of CO2 output. - CO2 ceramic diffuser to efficiently dissolve CO2 in aquarium water. - Holding bracket to securely install the cartridge to the side of the aquarium. - Connection hosing. - Helps ensure healthy and vibrant plants. 2.5" length x 1.5"width x 6" height