I have either that one or one very similar, came with 5ltrs of pH neutral foam liquid, use about an inch in the bottle with hot water on FULL thick foam Ive done my mk2 focus and my girlfriends Fiesta twice then pumped the left overs over my Dads work van. Mine was £35 posted and one of the best things Ive ever bought.

Brass fittings, fits my Karcher well. Cant fault it.