@HeiSINberg, Oooohhhh! I get it! It would fit into the drip chamber/tip opening and you'd have to ditch the whole drip cap with the AFC. I was getting very confused there. Basically the airflow controller with the tip would be set-aside. I was trying to figure out how the whole top cap wouldn't be used (as in the barrel/top cap). It's difficult sometimes to convey what we are talking about becasue there only shaky language we have to identify all these parts from atties that do their own thing.