yes those are encapsulated bulbs, water can not get to them to short out nor will the bulb pop if hot from use as u back into colder water, lots of trailers gots them. When one of mine went out I was on trip could't find spares til I got home Boat USA has them, bass pro should also maybe have to looks in parts dept. What I did cause the bulbs would cost $13.95 ea said to hell with it & put LED lites on trailer they are good for 100,000 hours also I ran a ground wire to ea tail lites as a added ground cause so many folks that have lite troubles well 99% of it, not a short, but bad ground.