12V Compact Vacuum Air Pump
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For $23 from Amazon, This is a Karlsson Robotics D2028, two-port,12V vacuum pump. ~4mm ID ports measured, yet...The Stated List: *12V motor *12W operation *1/4" barbs * 0-16" Hg vacuum rangeCustomers claim (Amazon questions under ratings) a maximum flow rate of about 0.5 cubic feet per minute, or 14 liters/min.Checked it - it works. I did not get a hickey when I plugged the vaccuum port with a finger. The exhaust port is just as active when there is no "load."The Amazon source:https://www.amazon.com/Karlsson-Robotics-D2028-Vacuum-Pump/dp/B00DYA21PU/ref=sr_1_2?dchild=1&keywords=Karlsson+Robotics&qid=1616818217&sr=8-2
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