Suit Nissan Navara D40 with YD25 Engine Built in Spain with Vin starting with VSK 

Suits Nissan Pathfinder R51 with YD25 Engine Built

This is the Black Bulb Between the fuel tank the the Fuel Filter for Priming the Fuel System.

This has a one way valve and is designed to keep fuel supply to the fuel filter.

when these fail it can contribute to hard to start issues when the car has been left sitting.