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CO₂ Valved Cylinder for Aquariums - 5kg

Full 5kg CO2 cylinder with a W21.8 valve, pre-filled and certified to AS/NZS 1841.6.

Regular price $349.99
Tax included Shipping calculated at checkout.
Weight: 5kg

Usually arrives in 2–5 business days

Delivery details

  • Dispatched within 1 business day
  • Proudly Kiwi since 2017
  • Expert advice

Ships to New Zealand

  • Free shipping on orders over $150. Not included: rural addresses and bulky items such as aquariums.
  • Under $150, courier is $6.80 to $9.90 depending on region, or $11.50 to $14.90 for rural addresses. The exact cost shows at checkout.
  • Rural and South Island addresses can take a little longer.
  • Damaged or faulty on arrival? Tell us within 7 days for a replacement or refund.

Full delivery details

Pickup available at Aquascape Shop

Usually ready in 24 hours

Description

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.
  • 5 stars: 1 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
K
Kevin (New Zealand)
Great product and service

Great product and service. Very happy with my purchase.