A change over apparatus of exhaust gas for use with {HEAD ~ a vessel} of {TAIL ~ a dump truck} having an exhaust pipe connected to an engine of the dump truck, said vessel having a plurality of hollow ribs integrally formed therewith, said change over apparatus comprising: 
A change over apparatus of exhaust gas for use with { HEAD ~ a vessel } of { TAIL ~ a dump truck } having an exhaust pipe connected to an engine of the dump truck , said vessel having a plurality of hollow ribs integrally formed therewith , said change over apparatus comprising :
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