I believe this is the vent to my plumbing but I’ve never seen a cap like this. Any ideas?
this post was submitted on 08 Oct 2025
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Sewer cleanout probably. Never seen a cap like this before though, looks kinda flimsy. Maybe get a piece of plywood and cutout/drill for holes that align with the nubs and turn the plywood so you can put force on all four nubs?
These have a spring loaded flap in the center that lets out sewage if there's a blockage downstream. Lets it out in the yard instead of your house.
As for opening, I use channel locks opened up all the way wide on two of the adjacent lugs and turn left.
Source: former sewer worker that would whipline these and televise.
Yes that’s exactly what it looked like when I pulled it out!
This is the one time I've seen a 3d printer might be more useful than using wood.