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