Aquarium CO2 Regulators & Parts
Precision CO2 Regulators for Planted Aquariums
Achieve consistent CO2 levels with our range of high-quality aquarium CO2 regulators. Designed for precision and reliability, these regulators (also known as pressure reducers) control the release of CO2 from your cylinder into the tank – supporting lush plant growth while keeping your aquatic environment stable.
Many models include a built-in solenoid valve for easy integration into automated setups, so you can control CO2 dosing with confidence.
Whether you're setting up a new tank or upgrading an existing system, you'll find durable, easy-to-adjust regulators for tanks of all sizes. Need help choosing? Our expert team is ready to assist.
Aquarium CO2 Regulator with Double Gauge & Bubble Counter – W21.8 Valve
$39.99
Keep your planted aquarium running efficiently with the Castle Dawn Aquatics Double-Meter CO2 Regulator, complete with a magnetic solenoid and integrated bubble counter. The dual gauge display enables you to...
CO2 Solenoid Valve – Inline Magnetic Regulator
$21.99
This compact and reliable CO2 solenoid valve is designed to provide safe, energy-efficient control over CO2 injection in planted aquariums. Crafted from corrosion-resistant aluminium alloy with a high-quality sealing ring,...
CO2 Regulator Dual Output – Two Bubble Counters & Gauge
$36.50
This premium dual-output aquarium CO2 regulator is perfect for aquarists running two tanks from a single CO2 cylinder. Made from high-quality aluminium, it features two precision needle valves and two...
CO2 Regulator PRO Extension – Dual Manifold Block Add-On
$26.99
Upgrade your CO2 Regulator with this manifold block extension, allowing you to run a second bubble counter and needle valve from a single regulator. Perfect for aquarists with multiple planted...