1000/400/500 Series MIL-C-4109 Industrial Interchange Air Quick Disconnect, Male Half, -06 Coupling, 1/4-18 Male NPT

This Eaton/Danfoss Hansen 400 Series quick disconnect plug meets the MIL-C-4109 dimensional requirements, so it should interchange with other brands adhering to that standard.

You are looking at a male half industrial interchange air quick disconnect plug with 1/4-18 male NPT threads and a -06 coupling size.

Built to meet MIL-C-4109 dimensional requirements, this male half is meant to interchange with other industrial interchange couplings that follow the same standard. That covers a wide range of common shop setups. The coupling size is -06 with a 1/4-18 Male NPT thread, so as long as your female half matches that spec and follows the industrial interchange pattern, you should be good to go without hunting down anything out of the ordinary.