This arrangement permits reservoir 2 to be connectively angled out of nesting relationship with {HEAD ~ trough} 28 by {TAIL ~ rotation} of valve body 24 about immobilized cylindrical valve member 24b, while simultaneous controlling valve operation in response to the relative positioning of reservoir 2 with respect to trough 28 
by
This arrangement permits reservoir 2 to be connectively angled out of nesting relationship with { HEAD ~ trough } 28 by { TAIL ~ rotation } of valve body 24 about immobilized cylindrical valve member 24b , while simultaneous controlling valve operation in response to the relative positioning of reservoir 2 with respect to trough 28
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