This one is almost not worth showing, anyone can do it, for anywhere including a boat. Marina used to have some slips with power and each pier had a hose hookup on the wall and half way down. I used to tee into the one at the wall and have my own hose all summer and let people use it. Last year the marina replaced all the piers and fingers, all got electricity and water on the same post on the finger instead. This one is just 110V and they all have a water faucet below. And they made the fingers narrower so I added a quick disconnect on the faucet. I use the hose, disconnect it when not needed and toss it in the dock box.