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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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!