Can't get away from the Borgs. So Voyager borrowed some technologies from the Borg. Withe the Daully Wheels on the rear axis, it's really difficult to check tire pressures and inflating the inner tire of the dually. Borg came to the rescue. With Borg metal valve stems, it allows checking the tire pressure and inflating the inner tire much easier by accessing the valve stem from the outer wheel. Metal stems are also a must to install aftermarket Tire Pressure Monitoring System (TPMS). I took it to my local tire shop, les Schwab, to have them installed.

Borg metal valve stems for the 2019 Sprinter with 16" Alcoa Aluminum Wheels:

https://yourtireshopsupply.com/product/7923/dl1spalfr-chrome-duallyvalve-wfront-stems-dl1spalfr

* I am not affiliated with the above link