I would like to seal the cover on my sump pit. Looking online for ideas and I see many "radon mitigation" setups with vents. All of which look like overkill.

I just like to keep odor at bay. Radon isn't my concern (I hope!).

Is a vent to the outside necessary?

best way to seal the cover down but still be able to open it..
remove the cover
clean surfaces to be sealed
lay down a good bead of 100% silicone seal
cover the silicone with saran wrap (or any good plastic wrap
put cover back and let silicone cure well
remove cover and plastic wrap
install cover and bolts/screws
now, you will have a nice tight fit but still be able to lift cover if needed.
chances are you will need some sort of vent for the basin. a dryer vent installed backwards would work. it would sit in the shut position but if the sump needed to suck air it could easily pull the flap on the backwards dryer vent.
ps/ I know my friend from SC is saying to himself "rube Goldberg"...

thx packy, sounds like your saying I need a vent...

so I gotta ask then... why is a vent necessary for a basic sump pit?

or is sealing and vents out of the ordinary?



Edited 2 times.

Packys saying as the pump ejects the water, a vacuum will be created unless air is allowed in to fill the void.

yeah, but you don't need to vent to the outside.
if it was a sewer ejector type system then it would need air going both directions.
when you flushed a toilet the water entering the tank would displace the air. that would have to have somewhere to go. so, a vent is needed.
but on your system since the water is just trickling into the tank and i'm sure the displaced air will go somewhere under the ground, just need to stop the pump from forming a vacuum.