You Do Need power plug adapter while traveling from Cocos (Keeling) Islands to El Salvador.

Here is Why You Need An Adapter

The outlet and plug type used in El Salvador are A and B and in Cocos (Keeling) Islands is I. This is how they look like.

In Cocos (Keeling) Islands, outlets of type I are in use.

Type I

In El Salvador, outlets of type A and B are in use.

Type A

Type B

I am from

going to