I believe this is the vent to my plumbing but I’ve never seen a cap like this. Any ideas?

  • Nate Cox@programming.devEnglish
    41·
    22 days ago

    I’d get a spare bit of wood, press it against one of the nubs, and then smack it with a hammer repeatedly. If you’re careful it shouldn’t stress the nub too much but the vibration may unseize the thread.