Help identifying cleanout cap

Cleanout cap broke while being removed. Looking for a replacment, if one exists, but need help identifying cleanout cap and where to possibly get another.

Please excuse my misuse of terms, but I'll try to describe what I'm dealing with.

Pipe/Tee side has a tapered flange. Cap side has 2 pins which tighten against the tapered flange when turned. Rubber gasket on the cap which creates a face seal against the pipe/tee. I don't see any threads on either side similar to the other cleanout plugs I'm seeing online and in hardware stores.

Home was build in the early 70s. I believe the pipe is cast iron. The cleanout cap might be brass. Pipe diameter is appx 4".


Thanks

Did the threads break off and stay with the tee? See if the material at the edge of the tee opening is brass.

It is some kind of "cam lock" cap, and as such it is completely "proprietary" to the manufacturer and since I have NEVER seen one, have no idea where you would find a replacement. In addition, since that tee is NOT an approved design, it may NOT have been intended for use in a drainage system , which would make the search even more extensive and difficult.