Steel; 5.600 in. Major od; 0.762 in. Lg of major od; double hub type; hubs identical; 4.960 in. Od; 0.490 in. Lg; 3 reed type; one way flow direction; inlet consists of 35 unthd holes 0.475 in. Diameter unevenly spaced on one face surface; outlet consists of eleven oval shaved slots on other face