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

Here is Why You Need An Adapter

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

Isle of Man

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

Type C

Type G

Italy

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

Type C

Type F

Type L