Any way to refill the old Kisag CO2 capsules?

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  1. So I have a few of these hoarded over time on flea markets. I love my dad’s old school siphon and would like to keep using it from time to time.

    These capsules have a valve in them, they are not punctured when used (FWIW they are the same as the whip cream ones, just not the same gas). Which means if should be possible to refill them again, for example from a SodaStream type can or the big ones for beer taps.

    Does anyone know if this fitting is even remotely standard and can be found?

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