Wilson Manifolds coolant manifold is designed to allow for efficient cooling of your engine. Exceptional 5-Axis lightweight machining with black anti-corrosive coating. Collecting coolant from both ends of each cylinder head provides uniform cooling while helping to eliminate dangerous hot spots. Consistent cooling also helps maintain consistency round after round. Adapts up to four inlets into a single 1-1/4", 1-1/2", or -16an hose outlet. You also can choose if you want the provision for a radiator cap or not.