In the second mounting position, the concave interior of the trough provides the pooling space, and an outlet of the reservoir is in pool feeding communication therewith, to permit {HEAD ~ at least partial emptying} of {TAIL ~ the contents} of the reservoir into the trough, when a contents emptying force is applied 
In the second mounting position , the concave interior of the trough provides the pooling space , and an outlet of the reservoir is in pool feeding communication therewith , to permit { HEAD ~ at least partial emptying } of { TAIL ~ the contents } of the reservoir into the trough , when a contents emptying force is applied
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