DC barrel jack weather cover for Home Depot skeleton / skelly / dog

I recently got the skeleton dog from home depot. The exposed upward-facing barrel jack didn't  sit right with me, so I designed this cover to (theoretically) protect it from the elements when the dog is left outside without the power cord plugged in. I don't have the 12ft skeleton yet, but I see no reason why this wouldn't fit onto that as well.

This is my first time working with 3D printed threads, I have no idea what the correct size is supposed to be, but after some experimentation this seems like it fits well enough.