Leaks from radiator valve tails.

[wilfster]

I've just fitted 2 new radiators. An aluminium Faral Tropical and a stainless steel Apollo Genova towel radiator. Both look very good. Problem with both is that I got a drip from where the valve tails screw into the radiator - all 4 of them. I used PTFE tape and I haven't stripped any threads.

I drained the system again, removed the valves and started again. This time I smeared jointing compound into the threads and then used PTFE tape on top. This time I've got one watertight joint and three with a very slight weep. What can I do to make the connections watertight?

 

[seco services]

have you wrapped enough ptfe on the tails useally a good 8 turns does it.

 

[ChrisR]

Was the tape still in the joint when you took the leaking ones apart? If not, you're putting the tape on the wrong way round, or too loose.
Sometimes 8 turns isn't enough, you find you need more like 28 turns
If desperate I put LS-X on top of the tape, and give it half an hour to go off.
Loctite 155 (or is it 151?) stringy stuff, is much better than ptfe tape.