This steel brake adapter has a 4AN male fitting (7/16-20, 37° convex seat) at each end. The 5/8" hex is large enough to support a crush washer (sold separately) when sealing either side against a flat faced port. If your female port is not deep enough, you can grind off the flare from one end for extra clearance. 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.