Normally you would have a high-pressure fluid line running from the power-steering pump to the steering box, and a low-pressure fluid return to the pump reservoir. With the hydroboost system, you remove the high-pressure hose from the pump and run a new one to the boost unit. Another new hose is run from the boost unit to the steering box. Finally, low-pressure returns are plumbed from the boost unit and the steering box. Here, the pressurized fluid line is plumbed from the boost unit over to the power-steering box.