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    Regulating CO2 Output - Solenoid and Timer

    Hi everybody, I'm aiming to rent out a 50# CO2 tank (20# tanks not available from my local welding supplier) to help my grow along - every bit of love and care helps! Right now I am searching for a solenoid CO2 tank regulator and a timer to regulate it. I'm assuming 300 ppm normal CO2...
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