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With a budget of 6K, what best regulator and solenoid can I get? I'd want to get industrial grade stuff than picking up run of the mill stuff. Looking at preferably a double stage regulator but single stage will do as well. Would definitely need the one with a precision needle valve. Additionally, to make things automated, I'd want to invest in a high quality solenoid valve too.

So far, I've been able to shortlist the following things:

CO2 Regulator:
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* Sterco Two Stage Co2 Regulator, SCD-6
* ESAB Dura CO2 Double Stage Regulator
* ESAB ECO 32B

Solenoid:
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None so far

Kindly help me with the recommendations.

you can go for ista regulator with solonoid, don't remember the model number. i'm using it since i had my first pressurized setup( almost 5 years now), i'm yet to see a better a needle valve.