1. Dual Small Gauges, accurate control of pressure in and out.
2. High Precision Low power consumption Solenoid Valve.
3. Made of hard aluminum alloy, surface spraying treated.
4. Fine tuning knob with knurl.
5. Bubble Counter And Tools Included! Together with bubble counter, you can read your co2 flow rate.
6. Bubble counter with check valve function, stop water back flow to bottle.