Isolate radiator

[houseplants]

Hi all

Hall radiator is leaking from the blanking plug , was going to replace or use PTFE tape to repair , trying to find a way to isolate the radiator however there isn't anything I can see , any advice would be appreciated

I have removed the 2 caps at the bottom However it's just a cover to the pipe

 

[terryplumb]

Remove the hexagonal cap nut ,with the logo on, from the valves ,there should be either a slot to use a screwdriver on ,or a hexagon shape for an Allen key .

 

[houseplants]

thanks I'll have a look