Suit: Nissan Patrol GQ TD42
This is the heater hose that connects the engine to the heater, this is one of the two longer hoses.
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 lose water and overheat. Generally, if one hose goes, it is possible for others to go soon after, so sometimes a good idea to replace your other heater hoses at the same time.