You Do Need power plug adapter while traveling from Italy to Isle of Man.

Here is Why You Need An Adapter

The outlet and plug type used in Isle of Man are C and G and in Italy are C, F and L. This is how they look like.

Italy

In Italy, outlets of type C, F and L are in use.

Type C

Type F

Type L

Isle of Man

In Isle of Man, outlets of type C and G are in use.

Type C

Type G