10pc Hi-flo Brass Quick Coupler Air Hose Fitting Plugs 10pc HI-FLO BRASS QUICK COUPLER AIR HOSE FITTING PLUGS Specification 10pc Solid Brass HI- FLO QUICK COUPLER AND AIR HOSE FITTING Set 2pcs 1/4 NPT HI-FLO Female Thread Quick" Couplers 6pcs 1/4 NPT HI-FLO Male Thread Air Connectors 2pcs 1/4" NPT HI-FLO Female Air" Connectors 1/4 NPT Fittings Are Made To Fit On Standard 3/8" Air Hoses Larger 1/4"" Internal Diameter Openings To Permit The Flow of More Air--won`t Choke Like Standard Fittings