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 Ligntning 45 bottle valves. The manifold has two 1/8" NPT ports allowing you to connect a nitrous gauge, fuel pressure gauge, or any 1/8" NPT accessory in-line with a -04 AN line.