Wash, soaper, foam and detergent nozzles. A detergent nozzle is a low pressure, high flow nozzle - it drops the pressure at the nozzle so a downstream injector will draw chemical and so the chemical lands on the surface instead of blasting straight off it.

Choose by fan angle and orifice size. The orifice has to match your machine flow: too small and you build pressure and the injector stops drawing, too large and you lose the fan. A 40 degree fan is the general purpose choice for wash down and vehicles, a wider fan suits gentle rinsing, and a narrower one gives more bite. Check the thread - screw on and quick connect are both common and are not interchangeable.