Why does my 1.5 ptrap not thread into my 1.5 waste pipe?

[cplZator]

Waste pipe

Above is a picture of the waste pipe I have coming out of the wall. It is definitely 1.5 inch. However, I purchased a new trap, and the nut (for lack of a better term) is too large for the threaded portion of the waste pipe. It just slips over them. Ignore the elbow in that product - I wont be using it.

Am I dealing with a difference in materials? What do I need to get (if I can) that will attach my new slip style lavatory drain to this weird sized threaded waste pipe?

Any help would be appreciated. Thank you.

 

[GReynolds929]

Those union trap connections are generally manufacturer specific. If not the same brand it likely won't mate up. I would cut off the existing elbow and install a new tubular trap.

 

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[Reach4]

Is the OD of the pipe coming out of the wall 1.5 inches or 1.9 inches?

If 1.9 inches, why not cut the pipe, and cement on a hub trap adapter. Then use a slip joint trap (that is probably the same as a tubular trap). Those are available in black and chrome in addition to the popular white. Slip joint is much easier to install and adjust than a glued trap.

I think some jurisdictions don't allow slip joints downstream of the U of the trap, but those are fairly rare.