Fits 1997-2020 GM Gen III/IV LS Engines;Neck rotates 360 degrees 30 degree angle for maximum versatility in engine swaps; Die-cast aluminum for strength and durability and resist corrosion; Thick mounting flange prevents warping and provides a positive coolant seal; Chrome-plated for looks; Allen head stainless steel bolt mount flush to flange for custom look; Uses commonly available 1-1/2 radiator hose (casting I.D 1-3/16");