Summary: Learn how to replace a radiator, remove the old radiator, fit the new radiator and fix radiator brackets.
If your radiator is leaking because of corrosion, you will need to replace it.
With a bowl in place underneath, unscrew the union nut that connects the radiator to the handwheel valve.
If you are keeping the connecting valve tailpieces from the old radiator, remove them with a spanner.
With a pencil, mark a vertical line on the wall in line with the position of the radiator's fixing brackets.
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