you need:
1) m seal
2) 12v motor (used in tape recorders)
3) plastic round cap
4) plastic wheel (to fix in the fan)
well here m seal is a wax based gum u can mold the gum as u like. i masked a fan u can see in the pitcher below it is used in the pump
http://youtu.be/F5xPI9pDNvo
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just loved the way you fabricated your own pump!!!... :D