I bought this new 5 gal. waterer at TSC: http://www.tractorsupply.com/webapp...02|16201|34411?listingPage=true&Special=false The water just flows right out of it. It appears to defy the laws of nature & gravity. The water should flow into the little trough thingee & stop, right? I have 4 other waterers that work of that principle. It doesn't stop. It just runs & runs. PLEASE, EXPERTS: Is there a trick to this model? Should I return it?