I just replaced 4 very old radiators with some new Stelrad radiators (rebadged Europa bought from Grahams).
They all leaked where I had screwed the valves into the radiator. The valves I bought already had PTFE tape wrapped round the thread so I simply took them out of the packaging and used my rad spanner to put them in.
I had to take them all out again, replace the tape, steel wool the threads in the rad and then put them all back together. All fine now.
Don't know if it was the quality of the valves or the radiator???
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