I was just gonna say the same thing. The black nozzles are always a soap nozzle dispenser to allow with the foam up if you downstream or upstream the soap, or use out foam cannon.

The black tip is basically designed to spray soap or cleaners to the project you are working on.

This channel is a yamatic channel yamatic is all about pressure washing equipment and they didn't know what the black tip is for?

I can't understand why nozzle orifice diameter never seems to get a mention.

1) WHY would you add MULTIPLE connectors/adapters when you don't need to. Especially on a Low pressure CHEAP machine. should have left the M22 fittings alone and used them. 2) NEVER use Teflon tape on fittings with O-Rings or flare, use on pipe fitting connectors only. 3) Someone who doesn't know what a Black Nozzle is (Which is for Detergent Injecting IF your machine is setup for that). Should NOT be Reviewing Pressure Washer Products. OVERALL FAIL. And YAMATIC should know better. I like your Products but OMG you should get a better person to talk about your Products. That's YT for you.