Brass, 4.875 in.Od, 2.125 in.Id, 0.438 in.Thk, counterbored one side 2.500 in.Dia by 0.219 in.Deep, diffuser groove 0.500 in.Wide by 0.219 in.Deep, diffuser groove 0.500 in.Wide by 0.125 in.Deep, one rectangular hole 0.563 in.Lg by 0.438 in.Wide, one slot on od parallel with axis 0.125 in.Wide by 0.156 in.Deep