I decided to install basement bathroom.

Installed new basin, run 3" PVC pipe for toilet, tub, sink drains
ensured 1/4" slope per foot, filled with water no leaks everything
is a OK. Ready to concrete

Oh wait, there is a leak, where 3" pipe enters basin...


So question would be how should I sealed pipe that enter sewage pit?

( I know if pump is working water level should never get that high,
and yet
I feel need to seal...)

Thanks,
Brian