Laars 40 Hoffman #40 Steam Vent 1/8" Angular - High Efficiency Steam Vent for HVAC and Boiler Systems - Perfect for Residential and Commercial Heating Applications

I only had this on my bathroom radiator for a few days before I had to remove it. When the heat would kick on it would be so loud that it was annoying. If you went into the bathroom you could see a plum of steam blowing out of the vent. I put another vent on and the noise and release of steam went away. Perhaps it is intended for something other than a radiator but I would never buy another one.