The unit was received loose in a poly zip-lock bag, unprotected.No outward visual signs of abuse/misuse other than normal signs of wear and tear over time.No discoloration or signs of contamination present on the body on the opti-neb.No cracks, dents.Some light scratches and dings associated with a regular usage.The compressor was connected to a 110 volt ac power source and was turned on; the unit ran without incident.An oxygen tube was connected to the compressor air exit port and the other end was connected to a hudson up-draft ii, opti-neb nebulizer that had been filled with tap water.The compressor was turned on: the air pressure coming from the opti-neb was sufficient enough to create a thick, plume of mist.The unit was loud which is an indication of usage, but still operating.No corrective action required as complaint cannot be confirmed.Root cause cannot be established.Unit operates as intended.
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