1. PROFESSIONAL COMPANY ON FITTINGS. 2. HIGH TECHNOLOGY AND QUALITY 3. COMPETITVE PRICE 4. DOT ISO CERTIFICATION PLUG-IN BRASS CONNECTOR1: SIZE: 4MM, 5MM, 6MM, 8MM, 9MM, 10MM, 12MM, 14MM, 15MM, 16MM, 18MM, 1/4, 1/2, 3/8, 5/82. MATERIAL: BRASS, PLASTIC MIX BRASS, PLASTIC3:USAGE: FOR PA/PU/PE/HYDRAULIC HOSE, PLUG-IN TYPE4. PHOTO: BRASS CONNECTOR