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U.S. General Flowgauge Regulator Part 47259 (CO2/Argon regulator)
Single stage regulator with high/low gauges. The low gauge is NOT the factory gauge, but works great for aquarium purposes. CGA320 socket (for CO2) and about 3ft of black silicone tubing included. Label on the knob has been worn off, but everything else is intact. No needle valve, solenoid, check valve, etc. You can use it as is, or opt to add the needle valve for more accuracy or anything else for your benefit. This is just the bare bones regulator with nothing else which is why the price is so low. $30
Single stage regulator with high/low gauges. The low gauge is NOT the factory gauge, but works great for aquarium purposes. CGA320 socket (for CO2) and about 3ft of black silicone tubing included. Label on the knob has been worn off, but everything else is intact. No needle valve, solenoid, check valve, etc. You can use it as is, or opt to add the needle valve for more accuracy or anything else for your benefit. This is just the bare bones regulator with nothing else which is why the price is so low. $30
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