Check the listing for details. SPEEDAIRE 30E740 Quick Connect,Plug,1/4" Body,3/8" Barb 30E740. Condition: New. Listed at 3.77 USD. Quick Connect Hose Coupling, Tru-Flate-Automotive, Steel, Plug, Male, Hose Barb, Coupling Size 1/4 in Tru-Flate automotive steel 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.Tru-Flate automotive quick-connect air couplings are compatible with other Tru-Flate couplings of the same size regardless of pipe size or barbed hose ID. Also known as automotive or Milton T couplings, Tru-Flate couplings were originally designed for the automotive industry. Couplings have an integral sleeve guard to resist accidental disconnection and a tubular val.