In the second mounting position, the concave interior of {TAIL ~ 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 the contents of the reservoir into {HEAD ~ the trough}, when a contents emptying force is applied 
In the second mounting position , the concave interior of { TAIL ~ 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 the contents of the reservoir into { HEAD ~ the trough } , when a contents emptying force is applied
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