help on details of 51686 small paint gun

[vintage750]

hi!
I have not painted in years. I purchased a #51686 HVLP gun for some motorcycle projects as it has a small volume.
(see https://www.eastwood.com/concours-hvlp-detail-gun-1-0-mm-plastic-cup.html )

The gun is fine but came with no paperwork. It has two knobs on the rear and one on the side. Can anyone tell me what these control?

thanks!
John MA

[Author]

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