Dongguan Hongtao Plastic Hardware Co., LTD
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(Total 1 Products for Exhalation Valve Cover Covid Price)
Exhalation Valves for Masks Breathing valve masks refer to masks with breathing valves, which are used to filter visible or invisible substances in the air that are harmful to the human body, so as to avoid adverse effects on the human body. Its working principle is that the positive pressure of the exhaust gas during...
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