Impeller Replacement EXT APO Base UOM:EACH listed in the parts list

listed in the parts list as Gasket

Confirmed against the HydraMaster CDS 4

Replace it — a gauge you do not trust is worse than no gauge

It is fitted alongside sensor 149-540 (Sensor

in water carrying whatever the machine has picked up

Impeller Replacement EXT APO Base UOM:EACH listed in the parts listOverview Replacement impeller for the external automatic pump out (APO) on HydraMaster truckmounts. HydraMaster part number 000 073 011, listed as Impeller, Replacement for any machine with external APO and, in later manuals, Impeller, Replacement for Posi Flow and Dura Flow. The automatic pump out empties the recovery tank while you keep working. When its impeller wears, the pump out slows, then stops keeping up, and the tank fills usually on the job