TW300S Carpet Extraction Spot Cleaning Machine
This machine has been put out in many different guises and colours by different manufacturers.
I've seen it mainly as the Hako Homeclean in light lilac colour with lilac tinted dome.
Taski used to call it the Aquamat 10 in Orange with a smokey brown coloured dome.
WAP did it in yellow and Nilfisk-ALTO in Blue. Again, this usually had a smokey brown coloured dome.
In the main the dirty water goes into a hard plastic upper tank, but some brands use a membrane bag and others a sealed tank.
Good luck with finding any parts you need!!