Can two adapters be combined?
No, this is not possible. You can only ever make one change with the JBL PROFLORA adapters. u95 --> u500, one-way Dennerle --> u001 or u001 --> m001.
Example: If you use the small 95 g CO2 cartridges with the JBL PROFLORA u201 pressure reducer to supply CO2 to your aquarium, you can make a connection from the u201 to the u500 disposable cylinders with the existing pressure reducer using the adapter from the JBL PROFLORA range. This means that the JBL PROFLORA u201 pressure reducer can be used with the JBL PROFLORA u500 disposable CO2 cylinders. The pressure reducer remains unchanged. This means that no further "adaptation" with the JBL PROFLORA CO2 ADAPT U - M is possible. This also applies to all other combinations of adapters.