How can I connect the rotating portion of my space craft to the non-rotating?

I have a large rotating (think wagonwheel) portion of a space-craft that, at the hub, connects to a non-rotating scientific research station. Imagine a football (soccer) field sized research and logistics station in microgravity, connected to a hub of a rotating space colony.

The floating scientists in the football field get to the hub, and then travel by ladder (or lift) to the spinning, near-Earth gravity colony.

My problem is connecting electricity (okay that's easy) as well as water, drainage, and sewerage from the non-rotating part to the rotating part. It needs to be one system. Has this been considered before? It's doing my head in.

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How can I connect the rotating portion of my space craft to the non-rotating?

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