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I wouldn't recommend it. The plastic air valve is more likely to leak, won't be as precise, and won't be able to handle as much pressure. For example, my air pump maxes out at 2 PSI but my CO2 diffuser runs at 30 PSI. Using the plastic, low pressure needle valve could easily result in dead fish, even if it seems to start out working ok.
 

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The amount of CO2 we inject is very small, just a few small bubbles of CO2 per second. That is smaller than a typical nuisance leak in an air valve. It is very likely that using a plastic air valve as a needle valve in a CO2 system would mean most of your CO2 would be lost to leakage, not used in the aquarium. Also, CO2 can make some types of plastic become very brittle. If the air valve is made of one of those plastics it would probably fail after a few weeks.
 
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