Aquarium CO2 Accessories
Upgrade Your CO2 System with Quality Accessories
Take your planted tank setup to the next level with our range of CO2 accessories. Whether you're running multiple aquariums or fine-tuning a single tank, these add-ons are designed to boost performance, increase efficiency, and maintain a clean, modern look.
From sleek glass connectors that blend beautifully into your aquascape to check valves, splitters, and tubing for multi-tank setups, we’ve got everything you need to customise your CO2 delivery system. Perfect for hobbyists looking to optimise flow, prevent backflow, or simply keep things tidy.
Explore the range and build a system that works as great as it looks. Need help choosing? Our expert team is happy to assist.
Castle Dawn Aquatics High-Pressure CO2-Resistant PVC Tubing
$1.50
The Castle Dawn Aquatics CO2 Resistant PVC Tubing (4/6 mm) ensures safe and leak-free operation of your CO2 system. Made from premium flexible PVC, it handles high pressure up to 6 kg...
Glass CO2 Drop Checker with 4dkh/PH Solution
$17.98
The Castle Dawn Aquatics CO2 Drop Checker is an essential tool when injecting CO2 into your aquarium. While CO2 is vital for healthy plant growth, unregulated levels can cause harm...
DIY Aquarium Budget CO2 Generator Kit
$24.99
This easy-to-use DIY CO2 generator kit is designed to provide an affordable CO2 supply for low-tech planted aquariums. By using a chemical reaction between baking soda and citric acid (or...
DIY CO2 Generator Bottle Caps - 2 Pack
$6.70
These quick-twist CO2 generator caps are ideal for DIY aquarium setups. Designed to fit standard soda or water bottles, they allow you to create a CO2 reactor for your planted...
CO2 Bubble Counter – Single Non-Return Valve
$11.99
Ensure precise CO2 monitoring in your planted aquarium with the Castle Dawn Aquatics Single Head CO2 Bubble Counter. Made from durable aluminium alloy and transparent acrylic, this bubble counter allows...
Stainless Steel CO2 Needle Valve Precision Control
$9.50
Achieve precise control of CO2 flow with the Castle Dawn Aquatics Needle Valve, crafted from corrosion-resistant stainless steel. Ideal for pressurised aquarium CO2 systems, this micro-dosing valve allows fine adjustments...
Glass CO2 Drop Checker - Hang On Style
$12.57
Keep your planted tank thriving with the Castle Dawn Aquatics hang on Drop Checker. This elegant glass tool helps monitor dissolved CO2 levels in your aquarium, changing colour based on...
Glass CO2 Drop Checker - Orb Style
$12.57
Keep your planted tank thriving with the Castle Dawn Aquatics Orb Drop Checker. This elegant glass tool helps monitor dissolved CO2 levels in your aquarium, changing colour based on the...
Castle Dawn Aquatics CO2 Spiral Glass Bubble Counter
$24.99
Enhance your planted aquarium CO2 system with the Castle Dawn Aquatics CO2 Spiral Bubble Counter. Made from high-clarity borosilicate glass, this elegant bubble counter not only monitors your CO2 injection...
Castle Dawn Aquatics CO2 Glass U-Tube 15 mm
$6.75
The Castle Dawn Aquatics Glass CO2 U-Tube 15 mm is a simple yet elegant solution for routing airline or CO2 tubing over the rim of your aquarium. Designed for use with...
Castle Dawn Aquatics Glass CO2 Bubble Counter - 17 mm
$11.99
The Castle Dawn Aquatics Glass CO2 Bubble Counter is an elegant and easy-to-use tool for monitoring the rate of CO2 injection in your planted aquarium. By minimising the visual footprint...