You Do Need power plug adapter while traveling from Puerto Rico to Liberia.

Here is Why You Need An Adapter

The outlet and plug type used in Liberia are A, B, C and F and in Puerto Rico are A and B. This is how they look like.

Puerto Rico

In Puerto Rico, outlets of type A and B are in use.

Type A

Type B

Liberia

In Liberia, outlets of type A, B, C and F are in use.

Type A

Type B

Type C

Type F