Review on PneumaticPlus Control Connect Controller Straight: Enhancing Precision and Efficiency in Pneumatic Systems by Evan Zurlo

I used this for a DIY CO2 system for my fish tank. It worked much better than many valves I've tried and was one of only two valves I've found in this price range that closes completely with no leaks (I've tried A LOT too, it's not easy, a good valve finding one that does doesn't cost a ton). I replaced it with another needle valve which I find offers more precise control but I love having this as a backup should I ever need it.