Need help with nozzle sizes and my downstream injector? Please help?

Off my 5.5 gallon per minute pressure washer what is the smallest spray tip I can use that will still pull soap and I can reach the highest levels? Can I still pull soap with a 0030 or does it have to be a 0040?

I use an M5 twist

Probably 0040

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Depends on the injector. If you’re using a 2-4gpm injector, a 0030 would probably work. Move up to a 3-5 gpm ds, and you might not be able to pull with a 30.

But my 0040 works great on my 5.5 machine for soaping and rinsing as high as 35’ (I go back to the truck to turn off the soap)