In article , David
wrote:
It is a while since I messed around with 110mm soil pipe fittings.

Digging a brown OSMA joint out of stock, I find it has a rubber seal
inside a collar.

First attempt to push in a length of grey pipe was not successful. I then
levered off the brown plastic ring with the rubber seal, slid this down
the grey pipe, fitted the grey pipe into the joint and it looked as
though the sealing ring would knock back down to grip the grey pipe.

I thought I had better check, and all I can find online so far is the
method of chamfering the end of the grey pipe, lubricating it with
silicone, and forcing it in.

Is my (possibly logical) way O.K. or should I reach for the lubricant?

Use lubricant

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle