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What you think about this video, is it correct way how to built drain system? http://www.1001answers.com/index.php?option=com_content&view=article&id=18:how-big-the-slope-of-the-drain-pipe-must-be&catid=5:pluming&Itemid=11 (http://www.1001answers.com/index.php?option=com_content&view=article&id=18:how-big-the-slope-of-the-drain-pipe-must-be&catid=5:pluming&Itemid=11)
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What is it you are wanting to do?
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Yeah.......... it's not a good thing to concentrate on American trades and standards!!!!
Like plumber, I'm not sure what you are after..
KC
PS ... BYE!!!