The black round box on end of hose is air filter for exhaust air injection, part of the emission control system. Don't know how you would go disconnecting the hose and blocking off the valve on the engine though, NSW only specification apparently. Just as easy to get some vacuum hose right size and replace. Just go to Supercheap or Repco and look to see what is available in similar size with 90 degree bend on one end.
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