Big performance in a compact footprint. The Fzone Mini regulator uses a triple-stage design to keep output pressure and CO2 flow rock-steady, even as your cylinder empties — no more end-of-tank dump or drifting bubble rates. Adjustable working pressure (0–60 PSI) and a precision needle valve let you fine-tune down to 1 bubble every 3 seconds.
 
A 12V DC solenoid keeps things efficient and quiet, while a built-in bubble counter with check valve prevents backflow and makes dialing in your rate easy to see. The durable aluminum alloy body is treated for long-term corrosion resistance, so it's built to last.
 
What really sets this regulator apart is its versatility with CO2 sources. It works with standard CGA320 threaded cylinders for larger, established setups, but it's just as at home on paintball tanks — a popular, refillable option for hobbyists who want more capacity without the bulk of a full-size cylinder. And for smaller setups, it also accepts 5/8" UNF disposable CO2 cartridges (80–90g), which are ideal for nano and desktop aquariums where space is tight and a full cylinder just doesn't make sense. That flexibility means one regulator can grow with you — from a small nano tank today to a bigger planted setup down the road — without needing to buy new hardware. (Note: not compatible with Fluval 45g 3/8" threaded cartridges.)