This billet aluminum manifold swivels on one end which allows you to attach the manifold without turning the entire manifold body. This is especially useful when attaching the manifold to the NX Lightning 45 bottle valves. The manifold has two 1/8npt ports allowing you to connect a nitrous gauge, fuel pressure gauge, or any 1/8npt accessory in-line with a D-4 or D-6 line.