Well they all come stock with a piece that connects into a hose. The screw on type. If you have a sink that has the same type of head as the hose, you can use that too. All you do is plug that bad boy into the hose/sink and then it does its thing. It will have 3 tubes. One for the water to go in, and one for waste water to come out, and then another tube where the desired water will come out of. Its all pretty simple to use. You can even upgrade the package and get a fitting for the unit that will allow you to connect it directly to the plumbing under your sink. Then you can keep it there all the time and use it when you need it. They have a bunch of fitting for the unit. But in general, the pressure from the water source ie, sink/hose will provide all the pressure that is needed to the unit. Theres no outlets or electricity involved. Everything is done via water pressure. Its a great investment if you ask me. Great way to get clean water for the saltwater aquarium, and even to drink!