Question about an air dryer Harbor freight

If you are looking for the dryer for spraying, then save your money. Look on you tube for compressed air dryer home made. There is one where they use 2" steel pipe, threaded at cap the ends. Thread caps for inlet and one for drain. Stuff pipe(mine is 12" long) with poly or blend poly cotton or straight cotton fabric. Best and cheapest system unless you are at the industrial level.