CO₂ Cylinders – Recommendations & Variants
All standard CO₂ cylinders can be used. We recommend the short and compact version with carrying handle and a fill weight of 10 kg.
These can be refilled economically or exchanged for full cylinders and are easy to carry thanks to their weight.
Cylinder variants compared
Cylinders without siphon tube
Must be placed upside down or rotated during filling so that the liquid CO₂ can flow downward and into the cylinder.
Cylinders with siphon tube
Also referred to as a dip tube or siphon line — they do not need to be rotated during filling, which makes the filling process more convenient.
All products in this series require CO₂ cylinders without a siphon tube.
100% compatible – matched to CO₂ cylinders
Carbon dioxide (CO₂) cylinders have a standardized right-hand gas thread to which our CO₂ adapter series are matched.
(Outlet connection: W21.8×1/14" RH female according to DIN 477 No. 6)
CO₂ Adapter Series with RPV support
Cylinder valves with a residual pressure valve (Residual Pressure Valve, or RPV for short) prevent contaminants from entering the cylinder.
Valves without a residual pressure valve allow both the withdrawal of gaseous CO₂ and the passage of liquid CO₂ for refilling processes. In valves with a residual pressure valve, an additional manual opening is required for liquid CO₂ withdrawal so that the cylinders can be filled completely.
With our CO₂ adapters, complete filling of your carbonation cylinders is possible regardless of the valve variant.
Advantage: Compatible with both valve types — for maximum flexibility when purchasing or exchanging your cylinder.
Cylinder valves – examples
Without RPV
(Examples)In the version without RPV, there is no insert in the area of the flow bore.
With RPV
(Examples)In RPV valves, the check valve is built into the flow opening.
Which cylinder is suitable for which application?
The right cylinder type depends on how the CO₂ is used. For refilling via an adapter, a cylinder with siphon tube is the most convenient option because liquid CO₂ can be withdrawn while the cylinder remains upright.
- For CO₂ adapter refilling, cylinders with siphon tube are optimal.
- Cylinders without siphon tube are also possible, but must be turned or rotated during filling.
- For CO₂ Direct Professional products, only standard cylinders without siphon tube are suitable.
Carbonation cylinders are not required for every setup. They are mainly useful if you want the simplest handling and a practical routine for refilling or exchanging cylinders.
This overview is intended as a practical orientation for choosing the correct cylinder type before purchasing or exchanging a CO₂ cylinder.