18 pieces - 1/4" NPT female, hi-flo quick coupler; 6 pieces - 1/4" NPT female, hi-flo plugs * 6 pieces - 1/4" NPT female, hi-flo quick couplers * High flow type air coupler. Larger 1/4 internal diameter openings to permit the flow of more are * Won"t choke like standard fittings. Professional high quality heavy duty brass couplers * Quantity: 30 pieces (6 - 5 piece sets)