Don’t require power plug adapter while traveling from Cocos (Keeling) Islands to Tonga.

Here's why you do not need an adapter

The outlet and plug type used in Tonga is I and in Cocos (Keeling) Islands is I and they are compatible with each other.

Cocos (Keeling) Islands

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

Type I

Tonga

In Tonga, outlets of type I are in use.

Type I