Description
Caleffi 508013A Hygroscopic Air Vent NPT Male is an automatic air release component used to remove trapped air from closed-loop piping systems. It operates using a hygroscopic seal element that expands and contracts based on moisture exposure allowing controlled venting of air while limiting fluid loss. This component is commonly applied in hydronic heating chilled water loops and other HVAC systems where air elimination is required for stable circulation. Installed at high points in the piping network it helps maintain smooth fluid flow by releasing accumulated air during normal system operation cycles.
