Results: the regulator knob was loose on the outside of the pump max housing.Conclusions: evaluation of the returned pump max revealed that the regulator knob was loose.If the regulator knob is overtightened while adjusting the vacuum pressure during use or preparation, damage such as this may occur.During the functional test, the pump max was able to be powered on and produce vacuum.The vacuum level could not be adjusted using the regulator knob.Penumbra pumps are visually inspected and functionally tested during incoming inspection by quality.The manufacturing records for this lot were reviewed and did not reveal any outstanding discrepancies, design, or quality concerns.
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