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Why not just have your existing broken radiator air vent replaced?
Not all radiators have bleed valves that can be replaced. Some radiators have bleed valves that are built into the radiators. This means there is no way you can remove the air from the radiator if the bleed valve is broken and the only option would be to replace the radiator.
If your radiator has a bleed valve that can be replaced our EasiBleed would be a fraction of the cost to use instead of replacing your broken radiator vent. It can also be installed within seconds with no need for draining off the central heating system.