Reliable Performance: The AN6 0 Degree push lock hose ends are machined and formed from a single piece of aluminum. Weld-free construction that gives better fluid flow and integrity over the normal brazed together hose ends. ANTI-LEAKAGE DESIGNS: 1. Push on with 37- degree mating angle which provided superior sealing 2. Push on lock fitting raised edges stop the hose from sliding and prevent leakage 3.Aluminum hose cover for hose sliding and protection of hose ends, smooth snag-free performance Size: 6an thread size is 9/16-18UNF,6an female to 3/8" barb, fitting for 3/8 inch ID rubber fuel line hose.