Multi-stage pump apparatus including sealing member

A stator assembly for a pump housing, the stator assembly comprising:

• a stator component comprising:
• a plurality of fluid inlet channels for conveying fluid to respective pumping chambers, each fluid inlet channel having an inlet port for conveying fluid into the pumping chamber;
• and
• a plurality of fluid transfer channels for conveying fluid to a respective one of the fluid inlet channels, each fluid transfer channel having an inlet for receiving pumped fluid;
• characterised in that the stator component is adapted to receive a sealing member for at least substantially sealing a fluid transfer channel from one of the pumping chambers to a subsequent pumping chamber of the pumping chambers or the inlet port to the subsequent pumping chamber to inhibit the conveyance of pumped fluid from the one of the pumping chambers into the subsequent pumping chamber;
• and
• a cover plate fastened to the stator component, wherein the sealing member is formed integrally with the cover plate.