Although I haven't run paint through it (I don't currently have the proper hose), I have no reason to believe it doesn't work. The valve is definitely working, the trigger and preset move correctly and the tips look ok. The tip installed is marked number 3 and the other is marked 5. Overall it is pretty clean with a little old paint in some crevices and corners. Everything included shows signs of its age, wear and being used etc. The box also has wear and signs of age including paint bits and spray etc. Any questions or if you need more pictures just ask.
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