"The previous reviewer has not solvent welded this fitting. It's designed to be solvent welded that's why it seemed a loose fit and has no rubber rings.
So make sure you solvent weld it and it will look better on visible soil stacks.
If your soil stack is not visible, or you might want to change fittings at a later date, use the bulkier SP581 which has a ring fitting. If your joining the SP581 to a cut pipe then you can solvent weld in an SP124 fitting. This turns your cut pipe back into a ring fitting.
The above was not obvious to me as a DIY'er so might help someone out."
"This is good for the price, simple, and very quick to install and matches the other floplast black soil pipe very well. For me it could have been a tighter fit when adding to the stack, all the other connectors have sealant rings inside and give you an assured connection, this one has none of those and the pipe just sits in it. That said it has been in 2 months now and had no problems with it at all.
It would be great if screwfix could stock these with only 1 or 2 bosses rather than all 3 mainly for the look of your stack."