In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
The 1/2" pipe is my make up water supply. The scoop is piped on the supply to the baseboard heaters, not the primary recirc line for the boiler. There are 2 circulators that run independently of each other. I have throttled back the flow by closing all of the baseboard inlet valves except for 1. I still don't get air from the vent. I get water only when I press the schrader valve. Maybe the scoop is plugged up with something.
Are spiro vents much better than the scoop?