(b)(4).The sample was returned and sent to the manufacturer (soundway) for investigation.Soundway reports: "check dhr and first sample confirmation, no abnormality is found." "to check the returned sample, first releasing the cannula of the co2 line in the case of co2 line ventilation , visibly bubbles can be seen from the cannula.Then sealing the cannula of the co2 line, there is no air leakage , so the co2 line is qualified.Similarly , releasing the cannula in the case of the o2 line ventilation , visibly bubbles can be seen from the cannula.Then sealing the cannula of the o2 line, there is air leakage , so the o2 line is unqualified.Further examination for the returned sample , we found that the o2 line was cut where the air leakage." "during the process inspection, we perform 100% gas flow test.Meanwhile , check the production process , it is impossible to cut the tube.We also ask the customer to let us know if there is any possibility of using the tool during use , which may cut the tube accidentally.".
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