Plastic pipe help

[ste69]

Hi all,

We've got this black plastic pipe running round to the back garden from a very old stopcock. I want to connect to an outside tap. As you can see it is bigger than 15mm but smaller than 20mm. Is it an old imperial pipe and is there any way to convert it to 20mm or 25mm mdpe?

 

[JohnD]

is the internal diameter half an inch?

What is the exact external diameter?

Are you sure it is not some kind of garden hose, rather than plumber's pipe?

Can you put up a photo of the old stopcock?

 

[ste69]

Hi, internal is 13mm so yes, as best to 1/2 inch as you'll get. External is 18mm.

Picture of stopcock, comes from the meter up though the floor and splits at a tee.

Don't want to take the pipe off there if I've nothing else to replace it with, as you can see there a wider bore pipe going off the other way.

The one I want to connect is the one going to the right.

 

[Tigercubrider]

Looks like there is some kind of adaptor sleeve in the compression joint?

 

[JimCrow]

You have 3/8" Alkathene, a philmac 1032 UTC coupling will get you to 20mm MDPE.
http://www.philmac.co.uk/products/details/?type=2&sub=31

 

[Agile]

I expect it is the old black alkathene water supply pipe.

I gather that it is possible to get fittings for it from a few plumbers merchants.

Whether that's worthwhile is another question. Might be able to replace it more cheaply with hosepipe or the blue mdpe pipe used nowadays.

Tony

 

[ste69]

Hi all, cheers for all the replies, I would replace the whole thing if I was sure I could get a fitting that will fit the stopcock pictured earlier.

 

[ste69]

How about if I were to replace everything above the tap, including the tee, is there a fitting that will go onto the top of the tap (a compression) that I could then continue with push fit fittings?