Fluid supply devices and fluid member for forming a mobile phase for a sample separating device

An integrally formed fluid member for combining and mixing fluids for forming a mobile phase in a fluid supply device, the integrally formed fluid member comprising:

• a plurality of fluid inlets, wherein a respective fluid is suppliable at each of the fluid inlets;
• a fluid combining unit for combining the fluids which are supplied at the fluid inlets;
• and
• a mixing unit for mixing the combined fluids and for providing the mixed fluids as mobile phase at a fluid outlet, wherein the mixing unit is a passive mixing unit without movable parts,
• and wherein the plurality of fluid inlets, the fluid combining unit, and the mixing unit are formed as single integral body.