1/2" BSP Automatic Air Vent Auto Cut Off Self Bleeding Radiator Valve

General description It is used to automatically remove trapped air from a radiator, eliminating the need for manual intervention. The valve features a shut-off cap that can be used to stop auto venting if required. Technical specifications Size: 1/2" BSP Operating modes: 1. Middle knob fully screwed in - automatic venting (shuts off automatically when there is no more air in the radiator) 2. Middle knob partially screwed in - vent open 3. Middle knob unscrewed - vent closed