Extensible house for reducing pressure pulses

An expansion hose for reducing the pressure pulsations and sounds associated therewith in hydraulic systems caused by a pump, specifically for power steering plants of automotive vehicles, said expansion hose comprising:

• an outer pressure hose connected to an inlet side end member and to an outlet side end member, an inner flexible hollow body arranged coaxially within the outer pressure hose to define an annular space between the inner flexible hollow body and the outer pressure hose, the inner flexible hollow body serving for conducting a pressurized medium and having at an inlet end and an outlet end, a nipple plug carried at the inlet end of the inner flexible hollow body, wherein the nipple plug includes a first axial passage providing communication between the inlet side end member and the interior of the inner flexible hollow body, and wherein a second axial passage providing communication between the inlet side end member and the annular space between the inner flexible hollow body and the outer pressure hose is defined between an outer surface of the nipple plug and an inner surface of the inlet side end member, and wherein the outlet end of the inner flexible hollow body extends freely into the outlet side end member, and wherein the outer diameter of the inner flexible hollow body at the outlet end is smaller than the inner diameter of the surrounding outlet side end member.