The FP4 power steering pump converts mechanical force into hydraulic force in order to supply the steering gear with a controlled volume of oil.
It is powered by the vehicle engine via a belt pulley pressed into the pump shaft; optionally via a hub screwed into the belt pulley that is pressed into the pump shaft.
The FP4 is attached to the engine mount. You also have the option of mounting it in the vehicle via the brackets on the pump.