
The pump body is wider towards the top. So when you're pumping liquid and the piston moves towards the end, the seals barely touch the walls and don't form a vacuum, causing the liquid to spill back out of the tube. Although the pump is designed for 500 ml, you can only draw 150 to 200 ml at a time. In addition, if you tilt the pump with the extractor down, the liquid will flow out in the middle. Bad design, not recommended.

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