CO2 regulator for $50?

Yes, but what they don't have (unless I missed something) is a solenoid valve to cut off the CO2 with a controller.
 
Barrett, I've got a regulator and tank. However, I think the solenoid may need to be replaced. I will look tonight and shoot you a pm. My tanks are 20lb and they are full so, make me an offer on the tank. I will give you the regulator because I don't know the condition of it. I got it with a setup I purchased not long ago.
 
Electric for this application. You can use controller if you choose to shut the gas on and off at a certain ph. If a controller is not used for this, you can simply plug solenoid directly into power. The normal position for these electric solenoids is (open) when power is supplied. If for some reason you lose power to your home or your setup, the solenoid closes and shuts the gas off. Hope this makes sense.
 
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