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Definitely use a flex line from the compressor to the hard pipe, a hydraulic hose is perfect. It will be rated far in excess of any pressure it will ever see on a compressor, it will last just about forever, it is available in any size or length and is easily found with pipe fittings. Also the lowest rated hose will be around 1500 to 2000 PSI or so and will be inexpensive so you will not need a more costly high pressure hose.
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