This lightweight water neck is machined from billet aluminum. A compact modular design allows the body to be flipped so that the -16 AN outlet fitting can face left or right. Features a top petcock for positive removal of air out of the cooling system, top and bottom o-ring seals, 1/2" N.P.T. rear port for temperature sender, and two 3/8" N.P.T. ports for cooling lines. Includes hardware.