Since we moved in we’ve noticed a sewer smell from time to time. I had a plumber come and identify this laundry discharge pipe not having a trap as the culprit. He ended up ghosting me so I cut more into the wall and found this black thing I couldn’t identify until now (I think). I guess it’s a drum trap after doing some more googling. If it’s working as designed I guess it’s supposed to hold water in and not let sewer gas through? but we definitely have a problem with the smell coming from this laundry room. Is this maybe not to culprit and I could leave it alone? I’m considering cutting it out and just connecting PVC the whole way through. Any recommendations or thoughts would be much appreciated.
(I’m not a plumber) if the trap is not leaking and it is not open on the top part i feel I would not change it.
But maybe a clean would help… that trap and (bottom) pipe seem to hold quite a bit of (dirty) water, and maybe sediment. Which can have it’s own smell (and they don’t have a trap upwords). I’d try some drain cleaner, maybe overnight, better according to instructions, and maybe flush it with loads of clean water afterwords, and see if the smell goes away for a good while. That could confirm (or dispell) that the smell is coming from that pipe.