What size test-cap for an ABS 2" -> 1.5" slip joint adapter

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BlueGoldfish

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Hoping this is an easy question for the gurus here - but I've searched for a while and can't figure it out as my measurements don't seem to map to various thread dimension charts.

I have a standard 2" ABS vent pipe that has a 1-1/2 threaded trap adapter coming out of the wall. I need to cap this off temporarily to perform a fill-test. Is the threaded ring on the trap adapter the same thread as a 2" ABS pipe cap or a 1.5" cap - or is it some other weird size? The actual dimensions across the threads are 1 13/16". I guess I could insert a glue-capped bit of 1.5" pipe into the trap adapter as a fallback...
 

Reach4

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Your screw on cap does not have to be ABS.
 
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Hey, wait a minute.

This is awkward, but...

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