No more annoying radiator bleeding by hand save up to 10 heating costs radiator ventor 12 saves 10 on heating costs finally these ventilators work automatically you no longer need to bleed every radiator the valve automatically and continuously bleeds water carrying systems such as radiators pipelines boilers floor heaters etc say goodbye to ruined furniture dirty water on carpets and walls dismantling of radiator linings etc the existing valve is simply replaced by the auto