Check the listing for details. DIXON VALVE & COUPLING 4FF4 Quick Connect,Socket,1/2" Body,1/2"-14 5CGR8. Condition: New. Listed at 25.01 USD. Quick Connect Hose Coupling, Industrial, Steel, Socket, Female, NPT, Coupling Size 1/2 in Industrial interchange steel quick-connect air coupling bodies are the female end of coupling sets. Also called sockets, they accept coupling plugs (nipple or male ends) to connect tools to air, water, or fluid lines. Steel couplings are hard and resilient with more damage resistance than softer metals and a wide working temperature range.All industrial interchange quick-connect air couplings fit the same size industrial interchange plugs no matter the pipe size or barbed hose ID. Also called Milton M or Mil-Spec (meet MIL-C-4109), these couplings are the most common interchange type. Couplings deliver high air flow with minimal pressure drop for efficiency. Sleeve guards prevent accidental disconnect.