WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of NISSAN NORTH AMERICA, INC.
1.
Tire pressure sensor
2.
Grommet seal
3.
Valve stem nut
4.
Valve core
5.
Valve cap
Parts that are replaced as a set when the tire is replaced.