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Not sure if this is what you are asking for, but you can use heavy duty extension cords rated for outdoor use.
Good for using under your stand. Or are you asking for something you can submerge?

You could use something like this...
https://www.homedepot.com/p/Extension-Cord-Safety-Seal-Green-2-Pack-H-EXT-302/204485133
Haha see my post above
I have no idea, it's just what I was told when the fire inspector man came and inspected the building I work at. We spent days rearranging our extension cords so they'd be up to code.How so?
I have no idea, it's just what I was told when the fire inspector man came and inspected the building I work at. We spent days rearranging our extension cords so they'd be up to code.
I'm not saying they aren't acceptable. I just plug mine directly into wall outlets, not into other extension cords. Maybe the fire safety inspector was full of crap? I just do what he says, that's all.So if extension cords are not acceptable, how do we do it?
I'm not saying they aren't acceptable. I just plug mine directly into wall outlets, not into other extension cords. Maybe the fire safety inspector was full of crap? I just do what he says, that's all.

