Hi vurbul,
Welcome to Aquatic Quotient! How did you find out about our community?
Do have a look at the upbrand or the Dymax regulators. They might just fit your 1 L CO2 cylinder. From the look of things, you might also be going 'too fast, too furious'. 2 new tank setups within 3 months!
In anycase, good luck with your setup and keep us updated of the developments. Better yet, show us some pictures!
Cheers,
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