Aquarium CO2 Splitters

CO2 Splitters for Multi-Tank Aquarium Setups
Effortlessly supply CO2 to multiple planted aquariums using our reliable aquarium CO2 splitters. These handy components divide the flow from a single CO2 regulator into two or more lines, allowing precise CO2 distribution across multiple tanks or diffuser points.

Ideal for aquarists managing more than one aquarium or using multiple diffusers in larger tanks, our CO2 splitters come in durable metal and high-precision needle valve designs to ensure control and consistency.

Whether you're expanding your CO2 system or fine-tuning your layout, you’ll find easy-to-install, leak-proof splitters that simplify setup without compromising performance. Need advice? Our expert team is happy to help you choose the right solution.

3 Way CO2 Distributor Splitter Regulator Check Valve - Castle Dawn AquaticsAquatic Aquarium Plant Care CO2 equipment

CO2 Splitter – 3-Way Needle Valve with FREE Extension Rod

$39.99
Easily distribute CO2 from one cylinder to up to three aquariums using the Castle Dawn Aquatics 3‑Way CO2 Splitter. Made from durable stainless steel and aluminium alloy, each needle valve...
CO2 Splitter – 2-Way Needle Valve with FREE Extension Rod

CO2 Splitter – 2-Way Needle Valve with FREE Extension Rod

$37.90
Easily distribute CO2 from one cylinder to up to two aquariums using the Castle Dawn Aquatics 2‑Way CO2 Splitter. Made from durable stainless steel and aluminium alloy, each needle valve...
6 Way CO2 Distributor Splitter Regulator Check Valve - Castle Dawn AquaticsAquatic Aquarium Plant Care CO2 equipment

CO2 Splitter – 6-Way Needle Valve with FREE Extension Rod

$47.89
The Castle Dawn Aquatics 6‑Way CO2 Splitter allows you to distribute CO2 from a single canister to up to six aquariums. Crafted from high‑grade stainless steel and aluminium alloy, this...
CO2 Splitter – 4-Way Needle Valve with FREE Extension Rod

CO2 Splitter – 4-Way Needle Valve with FREE Extension Rod

$32.99
Easily distribute CO2 from one cylinder to up to four aquariums using the Castle Dawn Aquatics 4‑Way CO2 Splitter. Made from durable stainless steel and aluminium alloy, each needle valve...