Instructional video how to convert an aqua culture dual air pump into a vacuum pump. Reverse the valves inside by turning the rubber seal and the blue valve assemby as shown. You can use this for filling bottomless fish tanks or sucking air out of tubes.
![Craft: How to make Glittery Sparkling Christmas Cards [Part 2]](https://cdn.mycrafts.com/i/1/1/46/craft-how-to-make-glittery-Add-m.jpg)
