This steel brake adapter has a male 10x1.25mm DIN bubble flare (convex) fitting on one end and a 3AN male (3/8-24, 37° convex) on the other end. This part also has a large enough hex (9/16") to be used with a crush washer (sold separately) when sealing either the 3AN side or the metric side against a flat faced port. Sold individually.
Convex vs Concave Seats