The Universal Half round vacuum end cap is machined from 6061 aircraft quality aluminum. The end cap is designed to key into the profile of our half round plenum extrusion for easy mock up and welding. It comes pre-machined with three 1/2" NPT holes for easy installation of hose barbs for all of your vacuum lines. This in conjunction with our other manifold parts make for an easy, clean, and different looking manifold that you can build yourself.