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Up for sale is a 20 lb CO2 cylinder 90% full, it has 900 psi, I've used it for two years and its only expired 100 psi. CO2 controller is in perfect working condition with a good probe. I'm including a regulator with solenoid, needle valve, bubble counter, and diffuser, but the solenoid does not work! Everything works but the solenoid. With this setup you could set a constant co2 bubble rate and monitor the co2 levels with the controller, or turn it off and on manually. $225 I'm located in spring, pick up only.
