Originally Posted by
diburning
This is what I use. The grounding/earthing pin actually works, and it works wonders in aircraft outlets on US carriers where the US part of the outlet is worn out and won't retain a plug, while the UK type G socket is nice and snug.
https://www.amazon.com/gp/product/B0080R95XI/
These are great and solid as opposed to some of the others which have "moving parts".
The only issue I have is plugging US polarized plug with one blade wider into these adapters.