Answer: Drive Airial Holding Chamber Item# MQ8001 is collapsible holding chamber for meter dose inhalers while item# mq8000 is just holding chamber for meter dose inhalers. Attached User guide: https://www.healthproductsforyou.com/ProdImages/CommonFile/Drive%20Airial%20Holding%20Chamber_Instruction%20Guide.pdf explains how to use both chambers.
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