The cable side is much tighter than ordinary waterproof. On the other hand, the side of the panel is quite normal: Especially, it is not felt that it is highly waterproof specifications, and the best way to do it.
It is used by drilling a hole in the case, but it is also easy to use with strength. There is no problem as long as the wire diameter and the part number of the main body are firmly considered for the fitting with the wire. It is quite a nice part.