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

Here is Why You Need An Adapter

The outlet and plug type used in Dominican Republic are A, B and C and in Isle of Man are C and G. This is how they look like.

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

Type C

Type G

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C

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