In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
What brand of main vent is this?
Has anyone ever seen one of these before? I'm not sure it's working right. It never seems to vent and I'm wondering if I should try and clean or replace it. My system has two of these, one on the end of each steam main. The only identifying mark on it is "#4" which I assume is the vent size.