What do I need to connect these 2 pipes?

WIAWSNB

Yes, gluing is a bodge - but the OP asked for a Heath Robi 😜

If she wants to DIY it, and if she doesn't want to force that screwed collar open, and if the rubber seal is missing from that fitting so the pipe pushes fully in easily, then a smear of adhesive should hold the black pipe in place sitting over the fitting's internal sleeve. It'll be nigh-on a solvented fitting, and will last 'forever'.

Lots of 'ifs', of course.

Someone else's idea of drilling a pilot hole and screwing through the white collar in to the black pipe is better, tho' a lot more awkward for a newbie DIYer.

bjorn_toby_wilde

I have shifted these carefully with pump pliers in the past. Gives you that extra bit of leverage, but you have to be careful not to squeeze too hard and squash the nut.

If it were mine and I couldn’t shift it I’d be calling the original plumber who fitted it and asking him to take a look.

grumpy_codger

https://forums.moneysavingexpert.com/discussion/comment/82008238#Comment_82008238

A belt strap wrench is much better for this.

bjorn_toby_wilde

https://forums.moneysavingexpert.com/discussion/comment/82008526#Comment_82008526

Excellent suggestion…and only a few quid.

I’ll file that away in the grey matter for future use.

JohnB47

I know this sounds bonkers but a bit of heat on that ribbed collar might help it to shift.

Either boil up some water, carefully pour it over the whole collar area and then, perhaps with washing up gloves on, try to unscrew it. Using a tightening and untightening action is often best.

Or use a hairdryer, probably on an extension lead, to warm the collar up. Amazing what a bit of heat can do to a stuck thread.

I recently used a hairdryer on a seized brass stop valve under the kitchen sink. It worked enough to allow me to gradually unseize it with a tighten/untighten action.

WIAWSNB

Being at an angle and so close to the wall, it's hard to get the usual thumb-forefinger grip on it, so I suspect that's why Rusty finds it hard to shift.

Almost certainly it'll move given a touch more force, say by an adjustable wrench. But I suspect Rusty doesn't have one.

I wonder if she has a neighbour or nearby friend or relative who could do this? This really is an easy job to sort, a perfect MSE DIY jobbie.

Heedtheadvice

I suspect Wiawsnb thar you are bright enough to realise that the charming lady is not very knowledgeable regarding the fine art of plumbing to any degree. I was appalledish that you used such a high tek term as 'squish' ! 😀

On a more serious note maybe need to be carefully if attempting to move that nut without squishing it if the pipe in the wall is free enough to rotate it may loosen another fitting under the floor causing a whoosh of gunge where it is not wanted at the next annual shower..…

I would clean all mating surfaces between the two pipes and then with some meths to remove any greasy residue and once dry fit all together with silicone sealer and allow to dry. Once cure ( maybe a day or two) it can be surprisingly strong but retain some flexibility

FreeBear

https://forums.moneysavingexpert.com/discussion/comment/82008526#Comment_82008526

I have a selection of grippy jar openers that I use for more than jar lids (great as a filter wrench when one gets stuck on a camera lens).

Rusty190

At the moment, the 2 pipes are rejoined but, I'm sure, it's just a matter of time before they part company again. I didn't want to pull them assunder to take more photos of the inside bits, as requested, but will do this next time it happens. I'll be back to report when this happens. In the meantime I've ordered the belt strap wrench as I'd never heard of such a thing and I like it. Thank you all for your input. Much appreciated.

WIAWSNB

The belt strap was a good call.

When you come to use it, you could put a dot with a felt pen on the pipe part behind the collar just in front of the wall. Then, as you apply pressure with the wrench, you can more easily see if the main pipe is also trying to turn.

How do you reach the pipe? Safe?