AQUATEK CO2 Regulator Mini Connect to paintball CO2 tank, no adapter required, no assembly required. (PLEASE NOTE: Paintball tank is NOT included, for demonstration purposes only). Please fill up your paintball CO2 tank if you purchased the tank online (e.g. Amazon) before using the regulator. The paintball CO2 tank is shipped empty due to safety concern. Cool-touch industrial solenoid design Precision needle valve for fine tuning release of CO2 Include bubble counter with integrated check valve Compatible with most CO2 atomizer and diffuser