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Continue to ChatEngineered for simplicity, durability and ease of use make the PMNG 1-3 series what we believe to be the most user friendly unit in the market. All pre-filters and controls are included inside the canopy. Only a supply of dry compressed air is needed to get nitrogen at the outlet of the generator Link: https://www.pneumatech.com/en-na/nitrogen-generators/membrane-nitrogen-generators/pmng-membrane-nitrogen-generators-1-3