Foam Cannon with Quick Connector

This foam cannon attachment is very high quality, judging by initial un-boxing and analysis of contents. However, I strongly disagree with the statement in the marketing & product description, "It works with any pressure washers, small and big are all working perfectly". This is plain wrong. I have a somewhat old pressure washer (Karcher 411a) and this foam cannon simply will not fit onto that lance no matter what I try or do. In my case, I anticipate buying a new pressure washer (I wouldn't touch Karcher) so I will hold on to this foam cannon for then. If you have a relatively new pressure washer that you are happy with, then definitely check that this foam cannon is compatible with your lance, if not then wasted time + annoyance.I've attached some pictures of exactly what the cannon attachments look like and how they fit together, because again, the marketing & product description is next to useless. Also attached is the full user guide, please read, to help you avoid the mistake I made.High quality, but buyer beware because there's a chance you may not be able to fit this onto your pressure washer lance, especially if you've got a Karcher.