Nilfisk-ALTO KEW slim (12mm wide) pressure washer double-pole switch 9.8 Amperes (Rated at 16A). It's for the Dynamic 6950 and will suit the ALTO KEW Professional Super machine AFTER the first of May, 1995 (01/05/1995)
It's no longer available, see for an alternative the THICK 6124300
They fit many pressure cleaners with different part numbers such as 146-1973-000 and G161004 Check the comparison.
I've photographed it at the side of the THICK double pole switch, 6124300 see the comparison photo above.
The width of the wider double pole switch is 24mm.
I agree, all this is VERY CONFUSING.
SAFETY WARNING! All electrical parts should ONLY be fitted by an electrically COMPETENT person.
As it's light, maximise the saving on postage and buy some of the related pressure washer parts below. Or some parts for your Nilfisk ALTO or WAP vacuum cleaner, such as dustbags and the filters or a new floor tool.
At the moment, standard postage within Australia is capped at a maximum of $20!