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

Here is Why You Need An Adapter

The outlet and plug type used in Israel are C and H and in Pitcairn Islands is I. This is how they look like.

Pitcairn Islands

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

Type I

Israel

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

Type C

Type H