Genuine Nissan Radiator Pressure Cap

This Pressure Relief cap is rated to 1.2 Bar

The Nissan Patrol GU with TB48 engine came out with this rating radiator cap which measures 118kpa along with the Nissan Patrol Y62 with the VK56 engine.
(This will aslo fit a standard radiator if you wish to change your pressure rating)

These are an item that are common to fail,
if you are chasing a pressurising problem with your cooling system, this is a good place to start.