Dave,

Is there more to checking out the regulator then just blowing into
one end while operating the valve by hand? If I push the valve
down it lets air thru. Let it go it stops the flow. Also the air is
going into the area where the diaghram is and not out the other
nipple? What is the other nipple for?

Are there any articles on how YS's system works?

Thank you,

Michael