The adapter is used to fill 425g (0.6l) cartridges (for SodaStream carbonators) with liquid CO2 gas.

Thanks to this reduction you can load your cartridge easily, quickly and inexpensively.

Filling instructions:
There are two types of 425g cartridges: one-way valve and two-way valve.

We screw the reducer onto the cylinder of the mother cylinder and the SodaStream cylinder (cartridge) 425 g onto the reducer.

       Turn the screw at the top of the adapter (mushroom head) clockwise - this opens the valve in the small 425g cylinder.
    
       Slowly open the main valve of the large mother bottle.

If we have a cartridge with a one-way valve connected, the valve should be unscrewed very carefully and only slightly. If we open the valve too quickly or too much, the one-way valve blocks the flow of CO2 and the entire filling process starts again.

If you have a cartridge with a two-way valve, open the valve fully.

       When filling is complete (no audible hissing), close the master bottle.
       Loosen the screw (mushroom head) until you no longer feel any resistance.
       Unscrew the 425g insert from the reducer.

That's all.