Premium 4L CO2 Cylinder for Planted Aquariums (Empty)

Elevate your aquascaping game and achieve lush, vibrant plant growth with the Premium 4-Liter CO2 Cylinder, available now at www.onyxaqua.com. Carbon dioxide is the essential building block for aquatic plant life, and having a reliable, appropriately sized supply is the secret to a thriving underwater ecosystem.

Designed specifically for the demanding needs of planted aquarium enthusiasts, this 4-liter tank offers the perfect balance—it holds enough gas to significantly reduce the frequency of your refill trips, yet features a compact footprint that fits neatly inside most standard aquarium cabinets.

Key Features & Benefits

• Optimal 4.0L Capacity: The 4.0-liter volume provides a long-lasting supply of CO2 for small to medium-large planted tanks, ensuring stable injection rates over extended periods.

• Durable & Sleek Construction: Features a robust, high-pressure cylinder body with a clean, brushed silver/aluminum finish that looks professional and resists corrosion.

• Standard Brass Valve: Equipped with a heavy-duty brass valve mechanism and a smooth-turning black top knob for secure and reliable gas flow control.

• Safety Certified: Built to handle high-pressure gas storage, featuring official safety inspection stamps deeply engraved onto the shoulder of the cylinder.

• Added Protection: Comes with a protective white mesh netting sleeve wrapped around the cylinder body to prevent scratches and accidental dings during transport and installation.

Technical Specifications

Important Usage Notes

Shipping & Filling: Due to strict courier and transportation safety regulations, this CO2 cylinder is shipped completely EMPTY. Before setting it up with your aquarium, you will need to take it to a local welding supply shop, fire extinguisher service, or specialized homebrew/aquarium store to have it professionally filled with pressurized CO2 gas.

Setup Requirements: To safely use this cylinder on your planted aquarium, you must pair it with a compatible CO2 regulator (sold separately). Once the regulator is securely attached to the brass valve, you can slowly open the black top knob to release the gas into your system. Ensure all connections are tight and leak-free before fully opening the valve.