Nonsense. Don't waste your money. Used in the nano tank. Worked more than a day, stopped working. I set it up with a 20 ounce paintball CO2 cartridge that runs at 40psi. No CO2 got past the bubble counter, which contained mineral oil. I checked my regulator, diffuser and check valve. Everything else worked. There was pressure from the check valve to the bubble counter, but there was no pressure from the bubble counter to my diffuser.
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