pmflav said:I ended up buying 2 of them, cheap enough to test.
I placed both in the shower, one on it's side, one on it's back. Left them in there for about 30 mins.
The one on the side had some water leak in, enough to be a concern. The other, which was on it's back had no water in it.
pmflav said:Found this on masters.
https://masters.com.au/product/101681221/masterplug-weatherproof-box
These are quite big and at $20 each, a bargain.