this post was submitted on 14 Nov 2025
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It's a septic or sewer clean out. Code requires them at certain distances of the drain system to allow for access to clear any blockages. You can use that access to run a snake.
It’ll save your ass from a big bill if your kids flush something they shouldn’t vs calling a plumber.
That's very good to know
Just be careful opening it. If there’s a blockage downstream of this clean out, you’ll see symptoms of the blockage somewhere else, and the pipe will therefore be full from the blockage right to the symptomatic drain. Hopefully it’s a floor drain, but it could be a lot of water with some possible pressure behind it so really think the situation through before cracking it open, and have a plan.
That's very good advice