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Thanks for that.

It was this one and on this page it shows all the different adapters and you need to select one.
Autogeek Pressure Washer Foam Cannon HP, foam lance, foam wash gun, pressure...

I read as much as I could but I need help.

I want to buy the Sun Joe 3000. I also what to get the foam cannon from AGO but I do not know what end connector I need as AGO does not list the Sun...