This bulkhead lets you embed a USB-C PD Fixtured Voltage Module inside of itself allowing you to use a USB-C charger at a fixed voltage based off the type of voltage module you purchase.

Simply take the module and place it inside of the ‘USB-C BulkHead - Main’ print, then use the ‘Internal PCB Mount’ print to secure it. Next attach the ‘USB-C BulkHead - Small’ print to make the completed threaded part of the model. Next slip it into your bulkhead hole and secure it from the other side with the ‘Outside Nut print’.

BOM:
https://www.amazon.com/MELIFE-Type-C-Voltage-Trigger-Module/dp/B0953G14Q2