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The NA9 is a heavy duty three stage design for compression from 6 to 9 scfm at 5,000 psi.
The NA12 is a four stage radial design for compression from 10 to 12 scfm at 5,000 to 6,000 psi.
The NA18 is a four stage radial design for compression from 14 to 18 scfm at 5,000 to 6,000 psi.