Simply in Setting up and operation. Ceramic provides best diffusing effect. CO2 cartridge no refill problem. “The convenience of not having the hassle in refilling cylinders” Ideal for Nano Tanks. These sets can be easily adapted to any kind of tank, even plug and play tanks. Ideal for beginners, and low light tanks, with low demands for CO2. The CO2 could last for months, if setup correctly. For low light tanks, the rate of 1 bubble every 5 seconds can guarantee the usage for months. Place the CO2 diffuser to the very bottom of the tank to achieve the best CO2 diffusing effect. INSTRUCTIONS: When fitting the regulator to the cylinder, DO NOT excessively tighten the regulator as this will cause the rubber ring inside to break. Once the reading of the pressure gauge is more than 0, it is sufficiently tight. We will not entertain any exchange or refund of goods due to broken rubber ring. CHARACTERISTICS： Disposable CO2 cartridge makes it convenient in not having the hassle of refilling it. Supporting rack included which provides elegance and easy installation. Top quality CO2 pressure regulator provides easy, precise, constant and reliable CO2 supply. Quality acrylic diffuser provides the best diffusing effect. Acid and break resistant. Included in set: - 1 x Air pipe - 1 x Air pipe holder - 1 x 3 in 1 compact V CO2 diffuser S - 1 x CO2 flow regulator - 1 x 95g disposable CO2 cylinder - 1 x Supporting base