The Redhorse Performance 2000 Series Push Lock Hose Ends are cut from 6061 T-6 aluminum on CNC machines to provide superior thread strength and leak proof performance. Our custom designed hose nipples and unique aluminum collars allow quick and easy assembly and smooth snag-free performance. Redhorse Performance's famous hand polishing and color consistent anodizing add the final touch of quality that professional engine builders have come to expect from Redhorse. Redhorse Performance 2000 Series fittings are engineered for use with our Redhorse Performance 401 and 402 Series high performance push lock hoses. Not to be used with standard braided racing hoses. For best results assemble with the aide of Redhorse Performance Assembly Lube and 420 Series Push Lock Hose Clamps and the 5420 Series push lock hose pliers.