Is this a drum trap on the drain line?

Is this a drum trap on the drain line?
It’s underneath a sink in a home that’s built in 1957.

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Yes, a form of drum trap without a clean out provision.

Its a homemade version of one… will act just like one. That’s a keeper photo. How much other home owner rigged stuff did you find in the home?

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Totally. Somebody installed wall covering over the cleanout cap for the cast iron drain line in the basement. At another cleanout cap, they painted over it. A plumbing vent stack was completely obstructed about ten feet down. Lots of plumbing and electrical problems.