508013A Hygroscopic Air Vent 1/8-Inch NPT Male, for hydronic heating systems and low pressure steam.
 Manual operation by rotating knob counterclockwise.  Radiator air vent designed to automatically remove any air trapped inside the emitters both during the filling of the system and in normal operations.
 
Chrome plated brass body.

• Max working pressure:  150 psi
  Max working temp:  212°F
  Low pressure steam: 15 psi
• Type: No Float
• Thread type: Male
• Body Pattern: Staight
• Thread Size: 1/8"

HCAL123280