MDPE stopcock.

[Screech20]

Hello chaps.

So I’m just doing my plumbing in my kitchen and come across a potential problem.

I have 15mm hit and cold running to under the sink, then from there, I have run a blue MDPE pipe out to the garage and outside tap.

I have purchased an MDPE - 15mm copper stopcock and started fitting it, and then realised that it has the direction of flow arrow going the other way, as if the blue would be supply, but for me, it isn’t.


Is it absolutely necessary to have a stopcock flow arrow correct? If so, what is my best solution here?


Many thanks

 

[terryplumb]

Besides the outside tap ,what else is the mdpe supplying ? And what size is it ? Fit a 15 mm stopcock to the copper supply pipe and a short length of 15 mm copper from the stopcock. Then fit an mdpe to copper coupler .

 

[Screech20]

It’s 20mm. It goes into the garage where I might, have me day, for a small hand basin, but really it’s just to go to the outside tap on the garage wall.

Do they do MDPE to copper brass fittings? I’ve just found a JG speedfit one.

Thanks.

 

[Elkato531]

The flow through a stopcock must go in the correct direction. They have a loose jumper which is held open by the flow. Reverse the flow and they will be held closed. You should be able to find MDPE to copper fittings at a plumbers merchant or at somewhere like BES.com

 

[terryplumb]

It’s 20mm. It goes into the garage where I might, have me day, for a small hand basin, but really it’s just to go to the outside tap on the garage wall.

Do they do MDPE to copper brass fittings? I’ve just found a JG speedfit one.

Thanks.

I have never seen one made from brass ,that's not saying they are not .

 

[denso13]

Do they do MDPE to copper brass fittings?

https://www.drainagepipe.co.uk/mdpe-copper-adaptor-20mm-x-15mm-brass-p-23009150/

https://www.jtmplumbing.co.uk/pipe-...ession-fittings-mdpe-copper-coupler-p886/s887

And other good outlets

 

[Screech20]

Needed it today so went for a speedfit.

Thanks all.

 

[aptsys]

What's with the brass threaded inserts on the iso valves?

 

[terryplumb]

For connecting flexi tap hoses I suspect.

 

[Screech20]

What's with the brass threaded inserts on the iso valves?

Tap tail ends.

 

[aptsys]

Looks like the same thread as the isolator valves

 

[flameport]

Looks like the same thread as the isolator valves

It is - but tap tails have a flat end for sealing onto the rubber washer properly, and isolators have a sharp end which will slice into the washer and cause a leak after a while..

 

[Londoner2]

I would get rid of that stopcock and replace with a ball lever valve.