The Atomic Paintball CO2 Regulator V1 & V2 series is a superior quality CO2 Regulator for planted tank setups using paintball cylinders. The nano regulators are designed specifically for use with Atomic CO2 diffusers. The V2 incorporates a 3.3 watt low voltage, high quality solenoid, engineered in Germany. The series features a super precise needle valve and speed-fit tubing connection for ease of installation. Features fixed working pressure, designed specifically for use with Atomic CO2 diffusers.