You Do Need power plug adapter while traveling from Tuvalu to Palestine.

Here is Why You Need An Adapter

The outlet and plug type used in Palestine are C and H and in Tuvalu is I. This is how they look like.

Tuvalu

In Tuvalu, outlets of type I are in use.

Type I

Palestine

In Palestine, outlets of type C and H are in use.

Type C

Type H