Automatic Bleeding Valve For Radiators Automatic Bleed Valve For Heating Set Of 1 2 3 5 Multi-Edge Valve 1/2 Radiator Bleeder PRODUCTS DISPLAY --> PRODUCTS DESCRIPTION --> Features: *Easy and uncomplicated replacement suitable for all conventional radiators with 1/2 inch thread. *Works with swelling discs- when in contact with water, the discs swell up to prevent leakage. *Saves heating energy through continuous and automatic bleeding of radiators. *It has a shut off cap that can be used to stop auto venting if so required. *Product has got 3 operating modes:1. Middle knob fully screwed in- automatic venting(it will shut off automaticaly when there is no more air in the radiator).2. Middle knob partially screwed in- vent open. *Middle knob unscrewed- vent closed. Specifications: *Size: 1/2" for BSP. *quantity:1/2/3/4/5pcs *Item dimensions:L x W x H 27 x 26 x 26 millimeters *Style:vent valve *Controller type:ring Package Contents: 1/2/3/5pcs vent valvefor you choose DETAIL DISPLAY --> SHIPPING --> _x000D_ _x000D_