Review on Aquarium CO2 Regulator with 12V DC Solenoid - Large Dual Gauge Display, Bubble Counter, Check Valve - Fits Standard US Tanks - Accurate and Easily Adjustable Flow Meter by Jamie Hyatt

I've been using it for a few months now to see how it performs over time and so far it's been working great and stably. The needle valve didn't need to be adjusted at all and is still stable. It's a cheaper option compared to competing products, so it's a bit rough around the edges, which is to be expected. The solenoid gets warm, which is a bit odd as others have pointed out. The biggest criticism I have is that the plug is grounded and almost all pluggable timers don't have a ground socket. Because of this, you need to buy a special heavy-duty timer, or manually ground it and remake the connector. All in all a good buy.