Edelbrock/Russell 660340 Blue Anodized Aluminum -4AN Flare Union Adapter Precision machined to ensure precise thread engagement Lightweight aluminum fittings are designed to match up with all Russell performance hose and hose ends 37 degree sealing angle guarantees a positive seal at maximum operating pressures Fitting size is -4 AN Fittings are available in straight, 45 degree, and 90 degree styles and this products fitting angle is straight