Suits: Nissan Patrol GU Y61 ZD30 DI (Not Common Rail)
This is the turbo hose that connects the Intercooler to the Throttle Body at the Intercooler End.
The brand of hose is GATES who make quality aftermarket hoses.
Over time, hoses become hard and this makes them weaker and prone to cracking, causing you vehicle to develop air leaks. Generally if one hose goes, it is possible for others to go soon after, so sometimes a good idea to replace your other hoses at the same time.