Spares & Accessories for CO2

CO2 Diffusers & Atomizers: Popular options include the Aquario Neo CO2 Diffuser Normal and inline CO2 atomizers and diffusers from WEEK Aqua, ISTA, Aquario, SunSun and other brands. Fine-mist ceramic diffusers help improve CO2 distribution inside planted aquariums.

Bubble Counters: Products such as the ZRDR CO2 Bubble Counter With Water Injection provide an easy visual reference for adjusting and monitoring CO2 injection rate.

Splitters & Manifolds: Mufan, Wyin Aqua and ZRDR offer multi-way CO2 splitters and manifold solutions for distributing one CO2 supply to multiple aquarium lines. Options include 2-way, 3-way, 4-way and 6-way configurations.

Check Valves & U-Bends: CO2 check valves help reduce the risk of aquarium water flowing backward through the tubing. Accessories such as the Mufan Stainless Steel CO2 U Bend also help keep tubing installations neat and organised.

Drop Checkers & Monitoring: CO2 drop checkers and indicator solutions provide a convenient visual method for monitoring dissolved CO2 conditions in planted aquariums over time.

Spare Parts: Replacement accessories include O-rings, seals, tubing components, clips and regulator maintenance parts such as the Spare O Ring for Wyin CO2 Regulator.

Diffuser type: In-tank ceramic diffusers are simple to install, while inline atomizers are useful for aquarists who prefer CO2 diffusion outside the aquarium through an external filter hose.

Hose size: Always check tubing and fitting dimensions. Many aquarium CO2 accessories use 4/6 mm CO2 tubing, while inline atomizers must match the external filter hose size.

Check valve: A CO2 check valve is recommended to help prevent aquarium water from travelling backward through the CO2 line when system pressure drops.

Bubble counter: Use a bubble counter when you want a quick visual reference for CO2 injection rate. Some models also include an integrated non-return valve.

Splitter or manifold: Choose a multi-way splitter or manifold if one CO2 regulator needs to supply two or more diffusers or aquariums.

Replacement compatibility: O-rings, seals and regulator spares can be model-specific. Always confirm brand, regulator model, thread size and fitting dimensions before purchase.

What accessories are needed for an aquarium CO2 system?
A typical pressurised CO2 setup may include a regulator, solenoid, bubble counter, CO2-resistant tubing, check valve and diffuser. Optional accessories include splitters, manifolds, drop checkers, U-bends and replacement seals.

What does a CO2 diffuser do?
A CO2 diffuser breaks gas into smaller bubbles so it can dissolve more effectively in aquarium water. Ceramic diffusers and inline atomizers are popular choices for planted aquariums.

Do I need a CO2 check valve?
A check valve is recommended in many CO2 setups because it helps prevent aquarium water from flowing backward into CO2 tubing and equipment when pressure drops.

What does a bubble counter do?
A bubble counter provides a visible indication of the CO2 injection rate, helping you make controlled adjustments to the system.

Can one CO2 regulator supply more than one aquarium?
Yes. A suitable splitter or manifold with independent needle valves can divide one CO2 supply into multiple aquarium lines.

How do I know which CO2 spare part will fit?
Check the brand, regulator model, thread size, tubing dimensions and product compatibility before ordering. O-rings and seals are often specific to particular regulator designs.

What is a CO2 drop checker used for?
A drop checker provides a visual indication of dissolved CO2 conditions using an indicator solution. It is useful for observing CO2 levels over time rather than providing an instant measurement.