Seals on shower door.
Can’t help with the shower door, but generally yes you need to be connected to shore power or on the generator for your standard AC outlets to work. The exception is the you MIGHT have an inverter connected to a few select outlets and they will work on your shore/generator when available or your batteries when it’s not. If you have this feature it will likely be connected to your TVs and your outside fridge if you have one. Oh, and welcome to the forum. Hope you enjoy the learning curve and many happy travels.
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