You Do Need power plug adapter while traveling from South Sudan to Vatican City.

Here is Why You Need An Adapter

The outlet and plug type used in Vatican City are C, F and L and in South Sudan are C and D. This is how they look like.

South Sudan

In South Sudan, outlets of type C and D are in use.

Type C

Type D

Vatican City

In Vatican City, outlets of type C, F and L are in use.

Type C

Type F

Type L