This product works very well. I have two comments that the R&D department needs to pay attention to: 1. LOUD. This is not a critical factor for me, but any effort to mitigate the high frequency noise would be very helpful. STRAW SIZE. Including 2 straws for attachment. Both were the same size with a fairly large diameter. You should use smaller diameter straws. The installation side has a fixed diameter, but the ejection side can narrow the rising force. IN GENERAL - a very good product. The engine revs slowly and pumps zero air! It has a lifetime guarantee so I'll get in touch and see how the company handles this faulty machine. keep for updates
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