We had a small leak on the other side of the vent on the drain pipe on the kitchen sink. No more leak, but the cesspool smell is horrible. Any ideas? Thanks!

Did you leave any openings on the drain pipe? Is the sink vented through the roof? Where is the cess pool? Is the cess pool a septic tank or a sump basin?

No openings that we can see. The sink is vented inside the cabinet, and we have a septic tank.

You still have small leak in your vent. Maybe in another place where you can't see but it's there.