Portable Electric Pump For HIM the key mechanism is the

the key mechanism is the "calf muscle pump" - with each step or pedal-stroke

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Works excellently on most windows: Single pane window

Portable Electric Pump For HIM the key mechanism is theFeatures Powerful Multi Purpose Transfer HoseA portable device lets you siphon and transfer a variety of non corrosive liquids and fuels through the flip of the switch! Applies to gasoline, kerosene, diesel oil, light oil, water, chemical pesticides, soap, mild detergent, deodorant, acid, etc. One Key Stop to Prevent OverflowSwitch precise control, open the switch automatically absorb liquid, close the switch will stop transmission within a second.