Karcher Foam Lance Help

[CH33MA]

Hey,
So today my karcher fitting foam lance arrived. All looked good, and im sure there were no extra fittings in the box. But when it came to attaching it to my actual gun its impossiable. The thread on the end of the gun is much bigger then the one on the foam attachment. I have included some pics to illustrate what i mean. Im not sure if its my gun and if there are a variety of sizes available.
Anyhelp would be appreciated.

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[Tigger]

Is your power washer an actual Karcher one? :S

 

[CH33MA]

yep Karcher HDS-655

 

[MRBILLYUK]

You've got a Karcher HDS 655 ? Looks like you've got a commercial one . They must have different fittings to the domestic Karchers .

I'm assuming you got this cheap / free as they cost an absolute fortune when new .