I've replaced some radiator valves with TRVs and I've got a problem with water seeping out of the joint between the valve and the tail on one radiator. I've tried tightening up the joint to the point where it doesn't seem to want to go any further and I'm a bit reluctant to apply any more force in case I strip the thread.
The original valves and the TRVs both had tails with 1/2 inch compression fittings so I thought I'd keep things simple by reusing the existing tails and avoid the possibility of introducing leaks round the threads of the tails if I replaced them. Perhaps this was a bad move and I was tempting fate by re-using the old olives already stuck on the tails.
My choices now seem to be:
1) Try to tighten even further at the risk of overdoing something.2) Strip it down again and replace the tail. If I do this then how much PTFE tape do I need to use and how tight does the tail have to be screwed in?
3) Strip down, leave the tail in place, carefully remove the old olive with a junior hacksaw and use a new olive.Any suggestions on the best approach?