I have run in to the bleeder valve threads letting air by, so I just kept bleeding not knowing the system was clean long before I quit! Next time I have to do it, I am going to weld two fittings in a spare MC lid for some hose to hook to. Then do the same in a 1 or 2 quart can. I plan to mount the can or hang it as high as I can in the garage so it has a lot of gravity pulling on it. I can then just open the bleeders one at a time and let gravity do it thing. Joe