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CO₂ Valved Cylinder for Aquariums - 3.5kg

A reliable, refillable and pre-filled 3.5kg CO₂ cylinder for planted aquariums. Certified to AS/NZS 1841.6 and fitted with a W21.8 valve, making it fully compatible with all regulators used in New Zealand and Australia.

Weight

Regular price $289.99 NZD
Tax included Shipping calculated at checkout.

Delivery and Shipping

Standard Shipping: Orders are typically dispatched within 1 business day. Delivery times vary based on the destination.

  •  Urban Areas: 1-3 business days
  •  Rural Areas: 2-5 business days
  •  Courier Services Used: NZ Post and Aramex.

Free shipping is available for New Zealand customers with a minimum purchase of $150.00.

  •  Non-Rural Addresses Only: This offer applies only to non-rural addresses.
  •  Exclusions: Bulky items such as aquariums are excluded from the free shipping offer.

Description

If you’re running a planted aquarium, a steady and reliable supply of CO₂ makes all the difference. This 3.5kg CO₂ cylinder is a great option for hobbyists who want longer runtimes between refills and a clean, professional setup.

Built to AS/NZS 1841.6 standards, this cylinder is safe, durable, and refillable at most gas suppliers across NZ and Australia. It comes fitted with a W21.8 valve, which is the standard fitting used here — so it works with all compatible regulators on the market.

Why this cylinder?

  • Perfect size – 3.5kg gives you months of CO₂ for medium to large tanks.
  • Certified safe – Meets NZ & AU requirements for refillable cylinders.
  • Standard fitting – W21.8 valve works with all local regulators.
  • Built to last – Powder-coated steel body with a solid brass valve.
  • Refillable – No waste, just take it in for a refill when empty.

Specifications

  • Capacity: 3.5kg CO₂
  • Height: 57cm (with valve)
  • Diameter: 15cm
  • Valve: W21.8 (NZ/AU standard)
  • Standard: AS/NZS 1841.6 certified

Good to know

  • Always keep the cylinder upright and secure.
  • Check for leaks when setting up your regulator.
  • Refills are available at most authorised gas suppliers.

Payment & Security

Payment methods

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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

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