Earls Billet Inline Distribution Block w/ -8 AN O-Ring Port to (2) -6 AN O-Ring Ports; Earl billet aluminum distribution blocks feature a modern compact design with a narrow shape, and smooth flow path for maximum flow. These parts are made from billet 6061-T6 aluminum with black anodized finish. The female AN O-ring ports are used with Earl's O-ring port adapters (available separately). The wrench hex allows for easy assembly & maintenance.;.