Help identifying stopcock thread

VoucherMan

My stopcock has a drain valve on it, but it's started dripping. I'd like to just blank off the thread but have no idea of it's size, or how to identify it. The best I have got so far is the thread on the drain valve measures about 1/2" in diameter.



I bought a 1/2" blanking plug, but I now assume on this fitting the 1/2" refers to the size of pipe, ie: the internal dimension, as the external size is about 3/4".

Did/do stopcock threads all use the same unit of measurement for threads, or can anyone say what size thread this would be (based on my 1/2" guesstimate )? My best alternative at the moment is to visit B&Q and see what similar looking sizes are available, hoping one will fit.

C_Mababejive

That is a weird looking stopcock of which i have never seen the like. I think the sticky out drain bit actually was never part of it but at some point, someone has removed the original 1/2" MBSP drain !!!! (maybe it was faulty) and screwed in this random fitting which looks a bit like a hydraulic or air fitting to me.

I presume the pipe to the left is the cold main?


I think one of these will fit..

http://www.screwfix.com/p/drain-!!!!-type-a-heavy-pattern/96725

[Deleted User]

Pipe threads are specified by the bore of the pipe they fit. 1/4" BSP is 17/32" nom OD, 1/8" BSP is 13/32" nom OD.

VoucherMan

C_Mababejive wrote: »

That is a weird looking stopcock of which i have never seen the like. I think the sticky out drain bit actually was never part of it but at some point, someone has removed the original 1/2" MBSP drain !!!! (maybe it was faulty) and screwed in this random fitting which looks a bit like a hydraulic or air fitting to me.

I presume the pipe to the left is the cold main?

I think one of these will fit..

The closest example I've found is http://badavalve.gmc.globalmarket.com/products/details/robinet-m-m-stop-!!!!-stop-valve-with-drain-plug-2036766.html, but it doesn't help me with sizes.

The water does come in from the left.
I have another tap now (pipe insulation on r/h of image) which is lower than the stopcock, so have no need of a drain valve there. That's why I'd like to just replace it with a blanking plug.

jack_pott wrote: »

Pipe threads are specified by the bore of the pipe they fit. 1/4" BSP is 17/32" nom OD, 1/8" BSP is 13/32" nom OD.

If I've understood correctly, my connector which looks to have a roughly 1/2" OD thread could be 1/4" BSP. If so the 1/4" option of http://www.ebay.co.uk/itm/Brass-Hex-Male-BSP-Blanking-Plug-/231611826855 will hopefully fit?

wealdroam

VoucherMan wrote: »

If I've understood correctly, my connector which looks to have a roughly 1/2" OD thread could be 1/4" BSP. If so the 1/4" option of http://www.ebay.co.uk/itm/Brass-Hex-Male-BSP-Blanking-Plug-/231611826855 will hopefully fit?

Possibly.

You might think about getting a similar sized thing from Screwfix for just over a quarter of that ebay price.

srm1

This appears to be very close to the wall and might require dismantling the pipework to remove the original fitting. Hope the outside stopcock still functions.

Photo shows what appears to be another small pipework connection to the top.
Any ideas what this is for?

VoucherMan

wealdroam wrote: »

Possibly.

You might think about getting a similar sized thing from Screwfix for just over a quarter of that ebay price.

Thanks, I'll nip in at the weekend. I did try searching, but the eBay listing was the only 'recognisable supplier' that showed up.

srm1 wrote: »

This appears to be very close to the wall and might require dismantling the pipework to remove the original fitting. Hope the outside stopcock still functions.

Photo shows what appears to be another small pipework connection to the top.
Any ideas what this is for?

It's about 2" from the wall. If I remove some of the fixing brackets I added, I can move it more, if needed.

The piece of 'pipe' to the top right is a leftover piece of telephone wire.

As for the outside stopcock, I haven't investigated that yet. It's outside my back gate, but I doubt I'll have the equipment to turn it off there. Hopefully this one will be simple enough to repair, otherwise I'll no doubt be back for further advice.;)

VoucherMan

Thanks for all the suggestions. The Screwfix plug was the correct one.
Successfully replaced the old fitting, and repacked the gland which was leaking a bit. Then moved on to fitting an outside tap, and finished with removing and flushing a radiator.:)
This internet thing has saved me a fortune, and deprived a few plumbers of a bit of easy work.