Right. Flux is then in F, 4 interface, as well as an interface to the letter you say what? If you do not really know how to pick, you can use the process of elimination thing: flux tube is not connected to you, that not only the three do? You first open the manual spray, feeling the air pressure of the three tubes and the outlet of the order to exclude. Control the air pressure of the trachea of ​​the nozzle atomization is small, and the control thimble pressure than the control atomization pressure, and the control thimble two pressure one after the other, the pressure in first-out Flanagan inserted above, the time at work is to the thimble press down so that flux emitted after venting Flanagan inserted below, work should thimble to push up to of flux spray with air isolation, flux stop jet is not easy volatile, repeated experiment.