first spring means disposed between the flange of {TAIL ~ said third pipe} and said third wall for biasing said third pipe toward its raised position thereby urging said shutter means to close said second pipe; whereby said third pipe is movable between {HEAD ~ said raised position} and a lowered position where said vessel is contacted with top end of said third pipe and said shutter means is urged to close said first pipe 
first spring means disposed between the flange of { TAIL ~ said third pipe } and said third wall for biasing said third pipe toward its raised position thereby urging said shutter means to close said second pipe ; whereby said third pipe is movable between { HEAD ~ said raised position } and a lowered position where said vessel is contacted with top end of said third pipe and said shutter means is urged to close said first pipe
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