Caleffi 1/2" NPT Male Air Vent Shut-Off, 150 PSI

The Caleffi Automatic Air Vent Shut-off only is used in the closed circuits of solar heating systems. They allow air contained in the fluid to be released automatically during the filling process, through a valve operated by a float in contact with fluid in the system . Features: Primary Connection Type: NPT female Secondary Connection Type: NPT male Primary Connection Size: 0.5 Inches Secondary Connection Size: 0.5 Inches