This systom i am helping a friend on has NO air release purge valves anywhere.Still can here air gurgle in the pipes but is better now since i tried valve. Couple on the top baseboards is all. I thought in stead of taking everything apart to put a air valve in why not use a saddle valve,?? Put on,poke hole, let air out and cap off. I did put one on it seems to work good.good to 1 1/4 pipe. Anything I am missing here?