Constructed from lightweight 6061T6 aluminum and designed for smooth flow, easy assembly, and longer life. O-ring seals allow 360° rotation. 37° AN flare assures leak proof sealing surface eliminating the need for taping. Compatible with all AN adapter fittings, as well as K1 Series Braided Stainless, K4 Series Black Nylon, and K44 Series Black Nylon E85 Hose