I've installed some new Kudox radiators and where the valve stem (or is it a valve tail - whatever, the bit that connects the valve to the radiator) enters the radiator there are leaks in 3 of the radiators. Not constant, just a small drip here and there. I've wrapped the threads in PTFE tape. Is it simply a case that I need to add more tape? I have filled the system and currently have flush solution going around, and will be draining that in the next few days to then refill the system with clean water with inhibitor. Should I fix the leaks at that point (draining down the system) or do it now while the cleaning solution is still in?

Simon Ferré, November 2013

Putting ptfe tape around the threads is a waste of time, you need to put it on the olive especially the bit that makes contact with the chamfer in the threaded part

toptrish, November 2013

boss white and ptfe tape.no more leaks

A1, November 2013