Leaky Soil Pipe

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I recently hit an underground soil pipe while digging, bit of a bummer, but no big deal, we were excavating anyway, so we cut a new length, re-attached with a slip-coupling and dropped it in. However, the other end (pictured below) going into the inspection chamber (right) now drips (you can see the small puddle beneath). Maybe it dripped before, maybe we caused it, I don't know, but I'd like to sort it before I bury the pipe. We can't get the pipe out now unfortunately unless we cut it in half and add another slip coupling, which I'd obviously rather not do. There might be a very small amount of wiggle room for me to pull it back by 5mm, but that's about it, I think.

Is it possible I got the rubber seal around the wrong way, or do they only fit one way? How can I go about sorting this?

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Joints want silicone-based grease or plumber’s lubricant gel.
Will need to see if its a good seal after cleaning
 
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Thanks. I'll pull it apart as far as I can and at least clean around the rubber seal as best I can. If that doesn't sort it, I'll have a look at some some grease!
 
If you've removed an old pipe and refitted a new section it's unlikely it'll ever seal again, the Gasket will have hardened over time and wont seal on the pipe. Just wrap some Denso Tape around it. (Filthy stuff, wear gloves and throw them away when finished.)
 
Wow, that stuff looks hideous lol. Something that nasty looking must be good! Nice to have another option to try, thanks. Also considering Flashband as an alternative now.
 
Wow, that stuff looks hideous lol. Something that nasty looking must be good! Nice to have another option to try, thanks. Also considering Flashband as an alternative now.
Denso will last underground, and is probably a lot more pliable, not so sure about Flashband.

One of my first jobs after leaving school, I was helping a Time Served Plumber who was installing a pair of 2 1/2" Steel Gas Pipes from the Meter Building, along a trench and up into the Building some metres away. All the buried steel pipework had to be wrapped in Denso Tape for protection, so guess who got that job. No gloves, and just cold water to wash my hands in!
 

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