This steel brake adapter has a male 7/16-20 bubble flare (convex) fitting on one end and a 4AN male (7/16-20, 37° convex) on the other. The 5/8" hex is large enough to support a crush washer (sold separately) when sealing either side against a flat faced port. Sold individually.
We also offer a 4AN Male to 7/16-20 Inverted Flare Adapter (Part No. 3265-11) for installations with an inverted flare (convex) seat in the female port.