Caleffi Brass Air Relief Valve Fitting:CALEFFI 15MM (1/2") MI BRASS AIR RELIEF VALVE All female threads 1 1/4"

All female threads 1 1/4" and greater are supplied with a stainless steel reinforcing ring

Ideal for dewatering of cellars and garages

Connects everything together nicely

5V AA alkaline batteries (included)

sleek and classy in appearance

Caleffi Brass Air Relief Valve Fitting:CALEFFI 15MM (1/2") MI BRASS AIR RELIEF VALVE All female threads 1 1/4"These automatic air vents eliminate residual air in heating and air conditioning systems without the need for manual intervention. This prevents undesired noise, wear of devices in the circuits and inefficient performance of heating units. Installation Air is vented from the system by turning the plug on the air outlet anticlockwise by one complete turn from the fully closed position. Air is automatically vented if the cap is kept in this position. It