CO₂ Valved Cylinder for Aquariums - 5kg

This is a pre-filled 5kg CO₂ cylinder, perfect for planted aquarium use. Safe, reliable, and refillable, it’s the perfect choice for larger planted tanks or aquascapers who want fewer refill trips.

Every cylinder is certified to AS/NZS 1841.6 standards, comes pre-filled with CO₂ gas, and uses a W21.8 valve — the standard fitting for New Zealand and Australia. That means it’s fully compatible with all aquarium CO₂ regulators sold locally.

Why choose this cylinder?

• Pre-filled with 5kg of CO₂ – ready to connect and use.
• Aquarium safe – suitable for freshwater planted tanks.
• AS/NZS 1841.6 certified – compliant and refillable across NZ & AU.
• Standard fitting – W21.8 valve works with all local aquarium regulators.
• Built tough – Powder-coated steel body with solid brass valve.

Specifications

• Capacity: 5kg CO₂ (pre-filled)
• Height: 67cm (with valve)
• Diameter: 15cm
• Valve: W21.8 (NZ/AU standard)
• Certification: AS/NZS 1841.6
• Use: Aquarium safe – for planted aquariums

Good to know

• Supplied full of CO₂ and ready to use.
• Always keep upright and secure during use.
• Check connections for leaks when attaching your regulator.
• Refillable at most authorised gas suppliers in NZ & AU.