Aeromotive Y-Block -06 to (2)-04 15671 - (1) AN-06 to (2) AN-04 Male Flare Y-Block. Aeromotive distribution blocks eliminate the need for additional fittings. The new Aeromotive CNC-machined, billet aluminum Y-Blocks feature A/N Style Male inlets and outlets, which eliminate potential leak paths, fittings, O-Rings and 'cost'. Choose from 9 different sizes ranging from AN-04 to AN-12.