Connect old rad valves to new rad

[TonyQJ]

Hi Guys. Sorry for such a long first post.

We have a 24 year old 10mm microbore ch system and on the advice of a plumber I’m going to change the rads a room at a time, as and when we decorate, to slowly achieve a more efficient system. I’m aware that modern metric rads will require an extender to get from the valve to the rad, but herein lies my problem.

The existing valves terminate in a 25mm male thread, with the rad tails (obviously) having a matching female. Modern rad tails, valves and valve extensions all appear to be 15mm. To replace the existing rad valves would require draining the system down every time I wish to change a radiator, so...

Is there such a thing as a Chrome 25mm extension tail? If not, does anyone have a suggestion that doesn’t involve changing the valves?

Thanks in advance for any advice.

Ps. When I say “25mm” that’s measuring across the thread with a tape.

 

[SimonG]

It will be 3/4".

Any pics?

 

[TonyQJ]

Pics:
Lock shield 1, lock shield 2, Radiator tail

 

[Riley]

3/4

 

[Harvest Fields]

As above

 

[TonyQJ]

So... is there such a thing as a 3/4” extender? I’ve not had much luck with my Googling.

 

[Riley]

Try a proper plumbers merchant

 

[ShaunCorbs]

Need to pull the the fitting out the rad then use 1/2 extensions from the fitting to the rad

 

[Riley]

Need to pull the the fitting out the rad then use 1/2 extensions from the fitting to the rad

1/2 - 3/4 extension pieces?

 

[Harvest Fields]

Toolstation. Is this any good?

 

[Harvest Fields]

1/2 - 3/4 extension pieces?

You can get them but I’m sure online only. Not seen a proper 1/2” x 3/4 extension. On 1/2 x 1/2”

 

[ShaunCorbs]

1/2 - 3/4 extension pieces?

Remove the rad tail out then it’s 1/2 both sides

 

[Harvest Fields]

Like my picture @ShaunCorbs ?

 

[TonyQJ]

Thanks all...

Plumbers merchants - I’ll try tomorrow if no joy on here.

Pull the fitting out of the old rad - that would work I think, which leads on to my next question - how? It has an internal hex about 12mm across the flats, does the tool for this have a specific name?

Toolstation - I cant see how that piece would help me.

 

[Riley]

https://www.NoLinkingToThis/p/radia...YUIl0X0VI3q5LJqM8txoCpQ0QAvD_BwE&gclsrc=aw.ds

 

[Harvest Fields]

If you cannot then if I was you I wouldn’t be fitting the radiator. That is your extender.

 

[Harvest Fields]

You need a rad spanner and some loctite also.

 

[TonyQJ]

Need to pull the the fitting out the rad then use 1/2 extensions from the fitting to the rad

https://www.NoLinkingToThis/p/radia...YUIl0X0VI3q5LJqM8txoCpQ0QAvD_BwE&gclsrc=aw.ds

Perfect. Many thanks

 

[Riley]

Or just change the valves to 15mm-1/2

 

[Harvest Fields]

Or just change the valves to 15mm-1/2

Far too easy that mate

 

[TonyQJ]

Or just change the valves to 15mm-1/2

But as I wrote in the OP that would mean draining down the system every time I change a rad.

 

[SimonG]

1/2" in the rads.

Rad spanner, unscrew them, clean them and use whatever size extender and then screw back in.

 

[ShaunCorbs]

Like my picture @ShaunCorbs ?

Correct

 

[Harvest Fields]

Correct

Cheers for the recognition mate. Thought I was going mad for a minute then.

 

[TonyQJ]

You need a rad spanner and some loctite also.

Yep thanks. Bought the rad spanner, got the fittings out and will clean them up. Already got the Loctite