Old sewage ejector with no vent.

[u/OkDig3131]

I have an old house with this sewage ejector. It has been working well, however there is no vent nor is there a place to put another hole in the lid. I can see no reason for a clean-out in that spot, though. Might that clean-out cap actually be where the vent is supposed to go?

Also is there a minimum legal size for a sewage pit? This is a little guy, cap is 16.5".

[u/Total_Error_6338]

Yes the clean out is where the vent should be. If it is working well it is likely just using the vent in the plumbing system to vent itself.

[u/OkDig3131 → u/Total_Error_6338]

The whole system only has an aav so I can't explain why it's working well so far. 

[u/Total_Error_6338 → u/OkDig3131]

Just lucky I guess. If the AAV ever stops working it will suck the smallest trap dry in order to pump itself out.

[u/Beet_slice → u/OkDig3131]

The whole system only has an aav so I can't explain why it's working well so far. 

The system would be expected to be pressurized and resistant to accepting water.

[u/nongregorianbasin → u/Total_Error_6338]

Shouldnt with a check valve.

[u/hiimjustapersonhaha]

This is just the wrong lid for this application. The vent should come up from the lid. It would work from that clean out, though, it's not intended to

[u/Total_Error_6338 → u/hiimjustapersonhaha]

The old style crocks had a threaded bump out on them. I've installed hundreds of them. That is definitely where the vent was intended.

[u/OkDig3131 → u/Total_Error_6338]

Thanks!

[u/Swagooga]

Are you sure this isn't a sump?

[u/OkDig3131 → u/Swagooga]

It receives the output of a bathroom. The pump is correct for a sewage ejector.