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Well hello Iron Man, this is the guy (savage54) a year ago that had air trapped in a boiler, and since it is a new heating season I fired up the boiler after installing the ball valve you had suggested and purged the system but still have air percolating inside the boiler. I can hear it from the inch and a quarter copper pipe coming out of the top of the boiler which is of course the supply line. I closed valve number three and hooked a hose to valve number four, open valve number four. Let water fill the rest of the supply system and hopefully push all that air out of valve number four but still have air in the system will enclose a picture with the valving numbers any help in this matter would be deeply appreciated thank you