Disposable or reusable CO2 cylinder?
There are 2 different cylinder types: disposable cylinders that are disposed of and recycled after emptying and reusable cylinders that can be refilled again and again. Many pet shops and gas companies can carry out the refilling. If you live in a region where refilling is a problem, the disposable cylinder can be an alternative. Should the refilling situation improve, you can always convert the disposable pressure reducer into a reusable pressure reducer in 2 minutes by unscrewing the adapter (JBL PROFLORA ADAPT U-M).
JBL refillable CO2 cylinders and many other refillable CO2 cylinders have the following thread connection: W 21.8x1/14 JBL
Disposable CO2 cylinders and some others (not all!) have the following thread connection: M 10x1