1. 
   Flushing trough
   A flushing trough is a long cistern which serves several WC pans. It is designed to allow more frequent flushing. == Common uses == Flushing troughs are commonly used in places such as schools, colleges, public toilets, factories and public buildings where quick refill of the flushing cistern is re...
   Found op http://en.wikipedia.org/wiki/Flushing_trough
   
   

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