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Soil pipe leaking, and diy inspection?

View the thread, titled "Soil pipe leaking, and diy inspection?" which is posted in DIY Plumbing Advice on UK Plumbers Forums.

I’ve had a rodent problem in the loft (I know they are in the drain because I saw rats in inspection chamber). The soil stack appears intact in the vertical loft section and vented at roof. I’m pushing the insurance to get a drain survey (water company did cctv the drain and said no defects).

I suspect where the vertical then goes into the horizontal with a turn is the problem area. The first drain guy sent (only for unblocking) said the bends can drop etc and as I know rats are there they might have made a hole. No sewer smells but the concrete doesn’t look dry around the collar.The photo is not great but there is water around the collar. Waste would be falling from 1st storey onto the bend so not sure if it splashes up?

I do have my own WiFi endoscope which I used to look in the cavity where the cold mains comes in and there is definitely nesting activity there.

What is the in the photo on the pipe? Is it an access panel on the pipe before it goes into a collar? Silly question but I presume it’s threaded with an O ring seal. As it’s old if I open it is it likely the seal fails? I did try getting my camera through a capped basin waste into the main soil but was on the small side to get into the main stack.

Cobwebs indicate no rodents but nesting material indicates they may have got in there in the past. Probably up through the cold water services entry.
 

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Ashman36,
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