What is this called and where can I get a new one?

[JustJohn]

Sometimes knowing the name of something is all it takes to find a new one. Can someone ID this for me? It's the rear pass through for my 69 Impala brake line:
175046

[Alwhite00]

Not sure what size you have but they have many sizes.

https://www.speedwaymotors.com/Speedway-Steel-Straight-3-8-24-IFF-to-3-AN-Male-Adapter-Fitting,32433.html