Raceworks -AN Rubber hose end fittings. Available in straight, 30, 45, 60, 90, 120, 150 and 180 degree bends. Sizes are for rubber hose inside diameter (ID) -4 (1/4"), -5 (5/16", -6 (3/8"), -8 (1/2"), -10 (5/8"), -12 (3/4"). These hose ends are designed to be used with no clamps in applications under 30psi. For all cases over 30psi, it is mandatory to use a hose clamp