This steel brake adapter has a female 7/16-24 inverted flare (convex) port on one end and a 3AN male (3/8-24, 37° convex) on the other end.
The 9/16" hex is large enough to support a crush washer (sold separately) when sealing the 3AN side against a flat faced 3/8-24 port. This adapter also has a groove to accept our Retaining Clip (Part No. 3607-001, sold separately) when used as a bulkhead fitting. Sold individually.