Plumbing help

[paronaram]

Hello All
My aquarium(s) located in the basement, and all water and sewer lines are in the ceiling
So I installed utility sink dropped cold water for RO and faucet, and for waste water I installed 35Gallon plastic bin with sump pump with water level trigger.

Everything works perfect except connection between Utility sink and bean it leaks...

Can someone recommend correct fittings to seal this connection?
No water pressure at all, all gravity
Everything I found in HD, does not seal this pvc pipes :grumpy:

 

[Reef Trends]

You need a uni-seal.

 

[SI REEF]

Use a bulkhead fitting

 

[edd]

looks like fitting and trap are differant pvc.
i think the trap is thinner walled.

 

[paronaram]

Thank you ALL

I will try uniseal
and see how it will work, and than bulkhead

Thank you