Kind of impossible for me to say - not least because I am only a DIYer, so have done 10s of not thousands of joints. I generally tend to go for around five or six turns. In my experience, that's enough to feel the string fluff up in the joint but without having to apply undue torque to tighten. Like you, my adjustable is about 250mm long. I've never felt the need to force it, and never had a leak, but I guess one man's force is another's light nip so I don't know whether you can read anything in to that! I have yet to refit the radiator and fill with water which will be the ultimate test, however I happened to notice that the nut of the radiator tail bound slightly when it was rotated around the tube of the radiator tail, which was not the case before I make it up ??

Removing and fitting valve tails - Designer Radiatorsdirect

You should definitely get a leaking radiator valve fixed as soon as possible, as water damage can really mess things up if left for any length of time. Can a leaking radiator valve cause boiler pressure to drop? To fix a leaking radiator drain valve, you will need to replace the rubber washer seal inside in most cases. Sometimes the tail will need to be replaced. If so you can follow the same steps above for replacing the PTFE tape. Radiator Bleed Valve Leaking However, rad tail sizes can vary from 8mm to nearly 30mm across the full range of different models, which are also available in a choice of different shapes and materials.

When I did radiators (ooh, I enjoyed typing that...), I always tried several tails (I kept spares) and having found the tightest, used liquid PTFE (Flomasta - Screwfix sell it, type in 5321J) instead of tape on both threads (ie the tail's and the rad's). If this doesn’t work, you should add some plumbing jointing compound to the threads on the leaking nut.

Radiator tails | Screwfix Community Forum Radiator tails | Screwfix Community Forum

Have I measured it wrong? Will 22mm or 3/4 inch work? The pipework is 15mm. I may just drain the system to take it off and have a service valve handy... Even so, anyone heard of a 1 inch valve? The only company I can find on google is radiator plus in Ireland Hi, is Plumb Centre a good place to get a reducing bush? There's one fairly close by I should be able to get to on saturday...In my experience, a radiator valve leaking when turned off is usually on ancient radiator valves that are worse for wear and should probably be replaced. Leaking radiator valve

Telescopic Radiator Valve Tail Short | Toolstation Telescopic Radiator Valve Tail Short | Toolstation

You might need to replace the head of the valve that the washer sits on which you take from another valve. Metric copper pipe is sized by the outside diameter. That's why 15mm copper pipe is almost indistinguishable from imperial 1/2" copper pipe, and why 15mm pipe fittings can have a nominal 1/2" thread (which is actually about 3/4" dameter).I'd start with 15 to 20 wraps of ordinary (thin) PTFE. Screw the tail in. If it doesn't start to get a bit tight after 4 or 5 turns (threads), unscrew, remove tape, and replace with + 5 wraps (so 20 to 25) and try again.

Radiator Tail Extensions - Trade Radiators

Refit the tail and tighten with an adjustable spanner (make sure it’s very tight or it will leak, add more PTFE if it’s not tight enough) Open the bleed screw with a bleed key to release the pressure and catch the water until stops coming outI first inserted the new radiator tails in the ends of the radiator dry to gauge how far it they would go when tightened up. This is another one of the taps that isn't leaking! The one inch measurement is the inside of the gold nut in between the rad and the valve, which is the radiator tail? Why would I want to take that off? Rad valve tails as mentioned by