plans for a good diy venturi?

Here's mine: Penductor in PVC
<a href="http://s1062.photobucket.com/user/karimwassef/media/ps6_zps85782da6.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/ps6_zps85782da6.jpg" border="0" alt=" photo ps6_zps85782da6.jpg"/></a>
 
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