You Do Need power plug adapter while traveling from Guam 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 Guam are A and B. This is how they look like.

In Guam, outlets of type A and B are in use.

Type A

Type B

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

Type C

Type G

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