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I was planning on using a Hudson valve for that.  It's designed especially for this kind of situation and it's relatively cheap.
by Bruce F (greenroofgrowers [at] gmail [dot] com) on Sat Mar 15th, 2008 at 02:16:13 PM EST
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I saw that, then forgot.
by Colman (colman at eurotrib.com) on Sat Mar 15th, 2008 at 02:25:14 PM EST
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