Not intending to be derogatory to anyone, but here in the States they are called "child-proof" electrical caps, not totally water-proof but...resistant.
I used to be some kind of pissed that the electrical outlets in my basement were halfway up the walls. But when said basement
flooded last weekend, I stopped feeling that way...
I sit corrected.
And, there are also Imperials who speak American. There's Admiral Motti in the original film, and I
think some of the First Order flag officers in the sequel trilogy. (Finn doesn't count, since I'm fairly sure he doesn't speak until he goes rogue.)
Also the stormtroopers all speak with US accents. Even Daniel Craig's cameo in TFA.
Fun fact: Not only did
Rogue One (my favorite film in the series, BTW

) feature unused footage from SW, such as bits with Red and Gold Leaders, but in at least one case, the original actor actually returned to record all new dialogue!
IIRC, it's when Gold Leader says "We're starting our attack run on the shield gate". In the original clip, he just says "We're starting our attack run" (meaning, on the Death Star), but the actor re-recorded the line, this time to refer to the shield at Scarif. And when Gold Leader actually mentions the shield gate, he's not onscreen (it cuts away right before he says that), so it doesn't look like bad dubbing. In fact you can hardly tell it's newly recorded, his voice has apparently not changed in 40 years!