Build a complete Baromax connector with backshell and locking ring.
Use a female locking ring with an inline backshell to mate with a bulkhead backshell. Get a pair of male and female locking rings with two inline backshells for a wire-to-wire connection.
Bulkhead backshells don't need locking rings.
We recommend using female pins on the side of the circuit that can source power, otherwise use male pins on the side that is harder to replace since female contacts wear faster.