This is the original foam cannon that I've had for 6 or so years. MTM has a rebuild kit for it, but I've never needed it. The new PF-22 is subtly better, but this one still gets the job done quite well. I haven't used the knock off, but I know this is much better built. It just keeps on working no matter what I throw at it.
This comes with a standard zinc 1/4" plug. You can chose to have a 1/4" stainless installed for $3. I'd recommend that. Just select in the drop-down.
*This works with most pressure washer hoses, but you may need to check the outlet size to get the proper adapter.