Just fyi in case anyone else runs into this. I found the Greenworks lance works in the kit that Lowe's sells for $34.99.
Shop Greenworks Plastic Gun Kit at Lowes.com
I tried the Bosch adapter but it got stuck in my gun so I had to go another route to get this to work.
Does anyone know if there is an adapter out there for this powerwasher (TF2000) to hook up a foam cannon? I've looked everywhere and cannot find anything. Anyone's input is appreciated. I think I have the last surviving unit in the world...lol.