New waste into old soil pipe

The original seal in that cast will also be well past it's best and won't seal very much any more.
 
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Don't forget all that all new rubber seals are invariably moulded silicone these days. That will be, in effect, what you are doing. Silicone does have it's place in modern plumbing, as long as it is used properly and in the right amounts, just don't use copious amounts everywhere. Just use enough with the clamping plate and old seal as the former to augment the seal and then it isn't a bodge. A bodge would be to smear loads everywhere coating everything, you don't need to do that.

o_O What's just enough? :LOL:

Silicone adhesive isn't like silicone sealant, it cures into much firmer/tougher rubber than sealant and therefore is a more permanent fix.

I have always wondered what the difference between the two were!

The original seal in that cast will also be well past it's best and won't seal very much any more.
I would second that! I was hoping to be able to buy a new one.
The one for the bathroom seems to be going well (touch wood) after almost 50 years, but then I don't think it has been disturbed in that whole time.

I think that a combination between yours and Jim's solution will work (y)
 
Just enough is down to experience I guess, though if it were mea then no more than a 5mm fillet around the pipe at the contact point with the boss and old seal then clamp it up, clear any excess and then it'll be as permanent as the original.

May be an idea to call round some of the current cast specialist and they may be able to help, depends if the boss will give up the old one. You could also buy a proper 2" cast iron strap boss and do it that way.
 

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