How to connect outside tap to MDPE

David Milligan · 17 Aug 2021

I have run 25mm MDPE under a new patio to bottom of garden and need some advice on how to connect to an outside tap while retaining the tap.

Is this a DIY task or should I just get a plumber in.

denso13 · 17 Aug 2021

David Milligan said:
Is this a DIY task or should I just get a plumber in.

You'll need to connect it to the pipe feeding the tap or fit a different tap with exposed pipework on the outside. It will also need a double check valve inside if you don't already have one.

Not particularly difficult but not really straightforward.

Madrab · 17 Aug 2021

The first prolonged below zero spell there is that'll burst. That and it needs covered or placed into a duct if it's to be above ground. MDPE is not UV stable and isn't really designed to be used above ground.

How does the tap connect to the water supply, is the connection on the other side of the wall or a compression fitting below the tap, cant tell as the pic is head on.

Bullet-Proof_Biscuit · 19 Aug 2021

You need a backplate elbow tap, and a mdpe compression male iron for the plastic, and probably a reducing bush to suit the different threads, (unless you get the comp MI with correct thread to suit the new tap. And as above, lag the pipe for frost protection.
Oh wait one post wonder, should've just said no lol

David Milligan · 12 Oct 2021

Thanks for the advice, I managed to do it myself connecting MDPE to copper below the patio.

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How to connect outside tap to MDPE

David Milligan

denso13

Madrab

Bullet-Proof_Biscuit

David Milligan

DIYnot Local

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