EHEIM CO₂ Magnetic Valve is an electromagnetic solenoid valve designed for aquarium CO₂ systems to provide precise on/off control of CO₂ flow. By connecting this magnetic valve in-line with your CO₂ regulator and timer or controller, you can automate when CO₂ is released into the aquarium (for example, only during daytime lighting hours or as controlled by a pH controller). The EHEIM valve operates silently and reliably, instantly stopping CO₂ flow when it’s powered off, which prevents CO₂ waste and allows for a safer night-time environment for fish. It features a standard 2-pin plug for use with timers or automation units and fits common CO₂ tubing. Using a quality solenoid like the EHEIM Magnetic Valve is key to a well-regulated CO₂ injection setup, giving you full control to synchronize CO₂ dosing with your aquarium’s needs and ensuring your live plants get CO₂ only when required.