Aluminum Rectangle Manifold Two inlet 3/8" NPT Four outlet 1/2" NPT is a high quality Pneumatic fitting. A thicker rectangular manifold that can handle more air volume compared to conventional Pencil Manifold. It comes with hex plugs on two side ends. High quality Aluminum bar is CNC machined for quality and precision, followed by black anodizing and finally the two side ends are cupped off with hex plugs.