What is the thread on this isolating valve?

Question

I recently stumbled across this group and it seems to be full of useful information. I'm hoping that somebody can help with this question..

I'm fitting an in-wall cistern for a new WC. The instructions that came with it are sparse to say the least. To connect to the cold water inlet, an isolating valve is supplied, but I don't recognise the fitting on the end. It seems to be a half inch thread with a fairly hard rubber type ring about half way along which a 1/2" female connector cuts a thread into. (If this description is not good enough and anyone is sufficently interested then I could email a photo)

Do I just use a standard 1/2" female iron coupler (screwfix no 12341) to connect this to the 15mm pipe?

Any help would be appreciated. John

Andy Hall · Accepted Answer

Can you post a photo on a web site somewhere?.andyTo email, substitute .nospam with .gl

John · Answer

OK here is my best attempt at a photo: thread that I am confused about is the one on the right hand side of the image.thanks, John

Andy Hall · Answer

I suspect that the end is a 1/2" male BSP and the rubbery stuff is a means of sealing it being equivalent to PTFE tape.

What I would do is to take it to a plumber's merchant or even DIY store and find a female BSP to 15mm copper fitting as you say. It might be an oddball thread but I doubt it.

Then wrap some PTFE tape on it anyway...... probably superfluous but won't do any harm.

.andy

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BigWallop · Answer

That's a standard half inch BSP fitting that takes a normal BSP tapconnector.

John Stumbles · Answer

I agreeIf you can run a 15mm compression nut onto the thread then it's 1/2" BSP,and you should be able to get an adaptor between 1/2" Female BSP (aka FI orFemale Iron) and whatever you want to connect to (15mmcompression/solder/pushfit etc)Totally superfluous - try it without!--John Stumbles-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                         Question Authority

John · Answer

Thanks for all of the advice.The 1/2" female iron coupler had the correct thread.  I thought that I'd try it first without any PTFE tape and it worked fine - not a drop leaked out so that's how I left it!

What is the thread on this isolating valve?

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