You Do Need power plug adapter while traveling from Sint Eustatius to Pitcairn Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Pitcairn Islands is I and in Sint Eustatius are A, B, C and F. This is how they look like.

Sint Eustatius

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

Type A

Type B

Type C

Type F

Pitcairn Islands

In Pitcairn Islands, outlets of type I are in use.

Type I