So I'm on the job at the first Presbyterian Church doing an install. This was one of the few remaining structures to survive the Chicago fire. Complete retrofit for what was once coal fired gravity system. One of the people pulled me over to complain about the room being to warm. Told my guys I would be right back,walked out took a leak came back and asked her how it was now. She said it was perfect thank me profusely and I went about my business. This is the metering device made from red brass float is copper formed crimped and sodered for the humidification and float.