Check the listing for details. SPEEDAIRE 30E672 Quick Connect,Plug,1/2" Body,3/8" Barb 30E672. Condition: New. Listed at 6.24 USD. Quick Connect Hose Coupling, Industrial, Steel, Plug, Male, Hose Barb, Coupling Size 1/2 in Industrial interchange steel quick-connect air coupling plugs are the male end of coupling sets. Also called nipples, they're inserted into the coupling bodies (female 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 disc.