You may want to replace the old radiator with a new one. See Removing a radiator for removal details. A new radiator may have wall bracket fastenings in a different position. Check the position required and move the brackets if necessary. If you intend to keep the valves from the old radiator, remove the valve tailpieces from it, using a special Allen key or adjustable spanner. When facing the radiator, the valve tail should be turned anti-clockwise. If it is too difficult to move, apply some oil to the thread and leave for a short time. Another method is to heat the joining compound gently with a hot-air gun. Use PTFE tape around the thread of the valve tailpieces before screwing them in place.
Next fit a new air vent on the same end as the previous radiator, using PTFE tape. The radiator is now ready to fix to the wall brackets. Reconnect the union nuts and open the valves to fill the radiator with water. Make sure the air vent is open to allow the air to escape. Check the area underneath for any leaks and reset the lockshield valve into position.
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