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Venturi For $5 Pump
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This scaled perfectly fits onto one of these super cheap pumps that can be bought for as little as $2! That's gotta be the cheapest possible air pump money can buy. It also fits a 4mm id air tubing. I left the supports on to give it a flat base. The Pumps I used. https://www.amazon.ca/gp/product/B0D26294SS/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&th=1
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