should these be sealed?

[michaelooch]

pix are of plumbing in my crawl

this one is the water softener discharge entering the PVC


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This one links drains to septic tank but it looks like this is open


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I have a furnace in the crawl and the air quality is my main concern...should these be sealed?

 

[leatherlung]

You should never have an open sewer or vent pipe in a crawl space. I would cap it off to prevent sewer gases from coming out. Does the water softener discharge into a trapped pipe? I can't tell in your picture.

 

[michaelooch]

I dont remember...ill have to check

The big black thing looks open so how should I seal that?

 

[Mr_David]

Drain test plug

Found this image in Google images

If the pvc for the water softner has a p-trap then that's should be okay