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I would say cross threaded I had it once ended up having to junk the rail and bought a better quality rad
True but for the inconvenience of using a tail with an o ring i don't mind paying 60 quid.
I remember when ladder towel rails were 2 or 3 hundred 25 years ago.
Reply to the thread, titled "towel rail tail tight" which is posted in UK Plumbers Forums on Plumbers Forums.
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