\The nifty little plumbing device located in the drain is designed to thwart most fat oils and greases before they enter a waste water disposal system. These can mainly be found in restaurants, resorts and schools but also in some households.
from 411HomeRepair.com http://www.411homerepair.com/diy/kitchen-bath/9893-The-Benefits-Of-Grease-Traps.html
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