In preparing to include a towel rail in my system I found that, whilst one of the radiator tails fitted perfectly the other was somewhat "slack", the thread being oversize (I suspect). No amount of standard PTFE tape would provide a leak free joint, and after much investigation I am to try a PTFE gas tape/Fernox LS-X combination. Is this a sensible solution? Would I smear the tail thread, then apply the gas tape, and also smear the radiator thread?
I had thought of having the joint brazed. Could that be done?
For fixing reasons I needed a radiator which was 1000mm wide and the only one I could find on the internet was in London, although it was probably manufactured in the Far East.
It is too much hassle for me to return it and I will therefore persevere with making it leakproof somehow.
I have no doubt that your solution is the correct one and who knows I may well have to cut my losses and buy another one.
If its not from the UK or made specific for the UK market the threads may not be BSP threads. Many other threads exist such as NPT, whitworth etc and even in tapperd threads rather than straight, This may be where the problem lies.
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