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We are adding a ceiling in our basement (64 year old house) and can not locate a obvious shutoff valve. They recently removed the meter from within the house and put one outside, and it has a shutout valve beside the meter. I also have noticed shutoff valves farther down the pipe inside (30 feet) in front of the furnace and water heater. I am just curious if this elbow (pictured) and the nubby on the side is a shutoff valve and if i should create an access port for it.

1 Answer 1


No, that's not a valve. It looks like a drain, as might be useful if the fitting had been installed in a fire sprinkler or steam line, or functionally just an odd-ball tee fitting.

  • I hadn’t considered that the pipes might have also been used for water. Drain seems accurate Commented Jan 7, 2020 at 20:30
  • 1
    Gas line can also have a "drip leg" , a downward bling leg that debris could drop into. I have incorporated them into gas lines. Commented Jan 7, 2020 at 21:15
  • Sediment/condensate trap drain plug... Commented Jan 8, 2020 at 3:53
  • This nub is lateral and flows sideways with the pipe and not downwards Commented Jan 10, 2020 at 2:06

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