1/2 rad tail for rad spanner

[ChrisC2]

I am wanting to fit a TRV but the radiator tail that come with all the TRVs I can find have the spanner flats on the outside not the inside. The problem is they need a greater distance between rad and pipe. I thought if I could replace the tail piece with a shorter one that still fits on the 15mm compression fitting then that would solve the problem. The existing manual valve is like this (10mm pipe) http://www.NoLinkingToThis/p/chrome-angled-radiator-valve/51257#product_additional_details_container

 

[Chriswareham]

not sure what you are saying but the valves on screwfix site are 10mm if you have got new valve that has a 15mm connection then you need a redusing set that fitts in side the 15mm compression as for the conection to the rad one you spanner in the outher you will need a rad spanner that tights from inside but they are the same distances

 

[ShaunCorbs]

Won't get it sorry op best to alter Pipework

Chris: he's trying to fit the loose nut part to a stnd trv body

 

[snowhead]

http://www.toolstation.com/shop/p60027?searchstr=radiator tails

 

[Darren Jackson]

You may have a bit of play in the pipework, try enlarging the holes in the floor boards where the pipe emergies and simply move them over a bit. If you do both sides you could push the rad over a bit more on it's brackets to give you just enough room. It usually works.

 

[king of pipes]

You can cut a piece off the new rad tail no more than 10mm though bud cheers k

 

[SimonG]

I've read it twice, once sober and now drunk. Struggling to figure out what the op is trying to do.

 

[Chriswareham]

i think we are all at a loss as to your problam can you take a photo so we can determene the out come thanks chris

 

[ShaunCorbs]

I've read it twice, once sober and now drunk. Struggling to figure out what the op is trying to do.

fit a trv by replacing a lockshield valve

but the trv pipe centres as you know it pushes it out more than a stnd locksheild valve

he wants connect the trv to the lockshield swivel / loose nut

 

[Chriswareham]

thanks simon g for that i have not laugh so much for a lone time

 

[SimonG]

fit a trv by replacing a lockshield valve

but the trv pipe centres as you know it pushes it out more than a stnd locksheild valve

he wants connect the trv to the lockshield swivel / loose nut

Got it. Cheers

 

[SimonG]

thanks simon g for that i have not laugh so much for a lone time

If I can help as I plough my furrow.......

 

[Chriswareham]

the lock shild and a tvr should be the same 4cm on each he only needs to change the union in the rad then or have i lost this in translation please send a photo to put us all out of are miery

 

[ChrisC2]

Sorry I wasn't clear, and thanks to those who have helped clarify. You have now got to the heart of it Chriswareham, TRV's need 4cm and the standard only 3cm. I had thought I would need more than 1 cm looking at the manufacturer's diagram. I wasn't worried about the downstairs one as the pipes are dropped from upstairs and so I thought there would be enough play, but the upstairs are very short. I have now dug some holes in the walls, as suggested by Darren, and bent one pipe slightly (without changing the angle going into the valve) so I'm sorted - thanks guys. I can now order the valves.

The measurement on the diagram is to the internal end of the tail though this is not clear (why would you need that?). I only know it now, so I thought I needed 3 cm not 1cm.

 

[Chriswareham]

you can bye extension pieces for the rads 10mm 20mm 30mm in crome

 

[oilman]

The tail connected to the radiator is a 3/4" socket, TRV valves use a 15mm male and if you need a longer tail City plumbing sell long tails for Radiator connections

 

[Best]

This is a problem I often come across when replacing radiator valves or radiators. I wish someone would manufacture 15mm rad valve tails that have no nut shape for spanner, but instead have an internal for Allen key. That would gain at least 12mm for a longer shaft on the tail.
As other replies, - screw tail fully tight, cut a small amount off tail if needed, ease pipework if possible.