Plumbing Question...

Beverley75

Good morning, 

The outdoor waste pipe (well, I think it is!) running from my kitchen sink, through the kitchen wall, to the outdoor waste fell off.... 

It looks like the ring screw on thing (coupling?) - a circular ring - joining the two pipes, is old and has snapped. 

What is this part called? A coupling?

And can I just buy the ring and replace it? 

How will I know what size to buy?

OR do I need to buy a new elbow pipe? 

Thank you ever so much, in advance, for any advice you can offer! 


(I feel like I should know the answer to this!) 

mi-key

They are normally just a push fit rather than screwed. Screwfix sell them in various sizes, search for push fit coupler socket

mi-key

Something like this https://www.screwfix.com/p/floplast-push-fit-87-5-double-socket-bend-110mm/12960

If the old one does screw on and the pipes have a flange, you can just cut this off with a saw, then push on the new bend to connect the two pipes up

markin

Looks rotten to me, replace it all if it's brittle, Sand the pipe edges if you cut a piece or you will damage the rubber o ring on the push fittings or struggle to twist it in.

It also seems to be lacking any sealant around the wall to keep water out.

happyhero

Yes replace all as markin says. You'll find it all breaks very easy now as it is so brittle.

Pull the elbow off the bit going through the wall and take whole lot to Screwfix or similar and they will give you equivalent as there are different sizes. Its all just push-fit so very easy to replace. A bit of fairy liquid will make it even easier to push together.

You'll have to cut new piece to length as it will come in 1 meter or 2 meter lengths.

This stuff is all very cheap to buy so don't panic on cost.

Hope that helps you.

PS warning, that bit going through the wall may need replacing too, it looks a bit brittle too. It maybe easy and just push through the wall to replace it.

grumbler

And it's worth replacing with black fittings, they are more resistant to UV.

And it makes sense to use a bigger radius bend:

rather than a sharp one -

 

mi-key said:

Something like this https://www.screwfix.com/p/floplast-push-fit-87-5-double-socket-bend-110mm/12960

This is 110mm soil pipe. The OP needs waste pipe

https://www.screwfix.com/c/heating-plumbing/waste-pipe-fittings/cat831524

mi-key

grumbler said:

And it's worth replacing with black fittings, they are more resistant to UV.

It also looks a lot smarter as well, and doesn't show up the grime half as much! 

ThisIsWeird

This is a nice DIY job, as explained above.

Best with two folk, tho', one on the inside to hold the pipe steady as you pull and push - as you will do.

To remove that broken fitting, grasp the bit of pipe coming out the wall firmly first, and twist the elbow back and forth. Worth removing that other length of pipe first, in which case grasp the elbow firmly, and rotate the pipe :-)

There are what looks like hairline cracks on the existing pipe as noted before, so don't be too surprised if that 'wall' pipe breaks. If it does, just be glad it happened when you knew about it, because otherwise it could be leaking inside your house for a good while first...

Can you see the inside pipe? Is it under your sink, for example?

Mr.Generous

Push fit waste, 40mm (or 1 1/2 ") black is best, I agree, although if property had white downpipes and bathroom pipes I'd just match to them. I use a smidge of petroleum jelly on the pipes to ease insertion. Grumbler gave good advice.

Beverley75

mi-key said:

They are normally just a push fit rather than screwed. Screwfix sell them in various sizes, search for push fit coupler socket

That's really, really helpful to know! 

Thank you 💐 

Beverley75

mi-key said:

Something like this https://www.screwfix.com/p/floplast-push-fit-87-5-double-socket-bend-110mm/12960

If the old one does screw on and the pipes have a flange, you can just cut this off with a saw, then push on the new bend to connect the two pipes up

Thank you