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 at least partial emptying of {HEAD ~ the contents} of {TAIL ~ the reservoir} into the trough, when a contents emptying force is applied 
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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 at least partial emptying of { HEAD ~ the contents } of { TAIL ~ the reservoir } into the trough , when a contents emptying force is applied
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