The UNS CO2 Paintball Kit provides everything you need to start a CO2 system for your aquarium without the stress deciding what to get! Injecting CO2 into an aquarium is a great way to promote healthier plant growth and bring out their true colors. For the best results, pair this kit with a strong LED light and good aquarium substrate. This kit includes either a 16oz UNS paintball CO2 cylinder, UNS mini regulator, Twinstar CO2 medium diffuser, and CO2 tubing. The CO2 Paintball Cylinders are available in two sizes, and offers a convenient on and off valve that eliminates the need for a pin valve and prevents accidental tank dumping during installation, making this cylinder a time and cost-effective CO2 solution. The UNS Mini CO2 Regulator is a dual-stage regulator with an added failsafe mechanism to prevent the end of tank dump. With a space grey finish and sleek design, this CO2 regulator is visually appealing as well as discreet.  Includes: UNS CO2 Paintball Cylinder UNS Dual Stage Mini CO2 Regulator Twinstar CO2 Diffuser - Small CO2 Tubing - Black/5 ft. Looking for a larger cylinder? Click here for the UNS CO2 Paintball Kit - 24 Oz.Note: Cylinder does not come filled with CO2 gas.  Please fill the bottle at your local welding supply, paintball, or brewery store.