Have found that in some cases, there is a huge leak in the large hose from the compressor. This drops the oxygen levels. The compressor is rated for about 40 PSI. Use your hand to feel for any large air leaks. Be sure to stay away from any moving parts for safety reasons.
The unit may have an exhaust muffler that is used to keep the noise down. Remove from the exhaust port on the compressor just in case it is defective.
See two attachments for low oxygen levels hints.
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