A pumping device including a housing whose front face is at least partly formed by a block of transparent material, this block containing a number of machine-drilled holes including at least one blind hole forming a work chamber, at least one hole forming an admission and/or exhaust channel leading into the blind hole, two through channels whose orifices on the front face of the block are fitted with hydraulic hose connection means, two solenoid valves, a plunger sliding leaktightly in a bearing fitted to the orifice of the blind hole, this plunger defining with the blind hole a volume that varies as a function of the axial position of the plunger, and a module connected to the base of the plunger for moving the plunger translationally. The pumping device can be used for pipetting, dilution, rinsing and/or dispensing of samples, regardless of the envisaged volume ranges.