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