Steel Adapter, 1-11-1/2 Female NPT Swivel To 1-1/4-11-1/2 Male NPT, Straight

Yes, it's designed for exactly that: connecting a 1-1/4-11-1/2 male NPT to a 1-11-1/2 female NPT swivel.

That's exactly what this fitting handles. The male end is 1-1/4 inch at 11-1/2 threads per inch NPT, and the female swivel end is 1 inch at the same thread pitch. The swivel feature on the female side gives you a little rotational flexibility during hookup, which can save some headache when you're working in tight or awkward spots. Steel construction throughout, so it holds up in demanding line work without issue.

It’s a straight pipe-to-pipe steel adapter with a 1-11-1/2 female NPT swivel on one end and a 1-1/4-11-1/2 male NPT on the other, so it matches that thread transition and swivel style.