Sodastream Duo to standard adaptor

I bought a couple of the new Sodastream Duo glass bottles and was surprised I couldn't use them on my older Sodastream machine. The bottles have different threads, so I made this adaptor to solve this problem.

I have printed the part in PLA with a low layer height in order to get the thread nice and fine. You also need a gasket from the lid of an old Sodastream bottle to make the connection airtight.

Please remember that there is quite some pressure in these bottles, so make sure that no one is injured if the part cannot manage the pressure.