Bypass line kit with all required components and pressure gauge for Helix, Medana CV1-L and MVI series pumps up to 25 bar. The use of bypass lines is always appropriate when the fluid contains large amounts of air or oxygen components or otherwise tends to emit gases. As a result of the recirculation between pump head and pump suction side, an accumulation of air and/or oxygen is permanently discharged in the area of the mechanical shaft seal. The manometer shows the final pressure after the pump and enables conclusions to be made regarding its operating behaviour.