Solid Brass Radiator bleeder Key 1 pack of 3 Efficiently bleed your radiators and restore optimal heat flow throughout your home. You'll will feel more comfortable and have a cosier home. Easy to use: To use a radiator bleed key, follow these steps: Turn on your heating and wait for it to warm up. Check each radiator for cold spots. If a radiator is cold at the top, then it needs bleeding. To Bleed: Turn off your heating and allow the radiators to cool. Locate the bleed valve at the top of the radiator. Place a container or towel below the bleed valve. Insert the bleed key into the bleed valve and turn it anti-clockwise about a quarter of a turn, or until you hear a hissing noise (that’s the air coming out). You might also get a few drops of water, so have a cloth to hand! Wait until all the air has escaped. Once the sound stops and water starts streaming out, make sure you catch the water in the container. Now it’s time to re-tighten the valve. Clean up any excess and move on to the next one! These keys are made of solid brass, with butterfly thumb turns, so long lasting and will handle the most stubborn valve. These radiator valve keys will suit most conventional radiator valves, saving you time. This universal radiator key is compatible with both older and more modern radiators., Manufacturer: Aretro