Grease pump unit comprising two serially connected pumps

A grease pump unit used for pumping viscous fluids comprising a grease pump for pumping viscous fluids comprising two positive displacement rotary pumps, a first pump (1) and a second pump (2), each pump comprises an inlet (3, 4) for fluid at the suction side and an outlet (5, 6) for fluid on the discharge side, the inlet (3) of the first pump (1) is connected to a reservoir of fluid by a connection (14) such as a pipe or hose, the grease pump comprises an intermediate part (7) comprising an inlet (8), a first outlet (9) and a flow path (10) for fluid, the outlet (5) of the first pump being connected to the inlet (8) of the intermediate part and the outlet (9) of the intermediate part being connected to the inlet (4) of the second pump, thereby forcing fluid from the reservoir of fluid through the first pump (1), through the intermediate part (7) and through the second pump (2) to the outlet (6) of the second pump during operation, wherein the grease pump unit is a portable unit where all the functional parts comprising at least the first pump (1), the second pump (2), the intermediate part (7), are contained into or fitting into a portable box.