The Adam's Pressure Washer Spray Gun attachment fits any pressure washer with a 3/8" quick disconnect fitting. The Adam's Foam Cannon uses a quick connect attached to the end to produce extreme foam. Most pressure washers have a typical wand style attachment, but that restricts you from getting into hard to reach areas. This product combines the proximity of your hand with the same power you're used to with your current pressure washer.
I used this about 8 times and it made washing the car fun! However, the quick disconnect failed after the 8th use or so. For how much it is worth, I'm extremely dissatisfied and disappointed that it failed. I looked at hardware stores to try to find a new piece to replace it myself, but could not find anyone local that is selling it. Otherwise, it produces great results.
Saying that this is the best thing since sliced bread would be an understatement. This gun, paired with some of Adam's Ultra Foam Car Wash, literally produces unicorns riding rainbows onto your vehicle! 150% satisfied. :)