Investigation summary: a device history record review was completed by our quality engineer team for provided material number 306595 and lot number 0175458.The review did not reveal any detected abnormalities during the production process that could have contributed to this defect and all quality tests were found to be within specification.As a sample was unavailable for return, a thorough sample investigation could not be completed.Based on the investigation results, an exact cause for this incident could not be identified.It could be possible the customer is not using the product as intended.This product is not designed to pull the plunger rod back, only to push it down.Further action has not been determined necessary at this time.
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