Leaking radiator on which I closed the valve

[galaxy_plumbing]

P923.4 Stop End 15mm 2 Pack

Pair of end caps. Take it apart and use threaded end to screw onto pipe where your valve is. Would need to drain system or some of the water to be able to remove valve.
This may be handy
Good luck

 

[DiamondHead]

P923.4 Stop End 15mm 2 Pack

Pair of end caps. Take it apart and use threaded end to screw onto pipe where your valve is. Would need to drain system or some of the water to be able to remove valve.
This may be handy
Good luck

Sounds like this is the ideal solution. I've ordered a tube of that Evo-stick sealant now and understand that this should do the job. I plan to place the plastic cover back over it to make it snug. That can always be cut off later if necessary. I'll keep this info in case it doesn't work! Cheers.