Superior 90 Degree Elbow for Secure Vent 4.5/7.5 Rigid Vent SystemWhat's Included Elbow Features Aluminized inner wall with galvanized steel outer wall Secure twist lock connections Can be swiveled at the base to change offset angle The total height of 12 inches Measures 8 1 2 inches from base to centerline of horizontal center pipe For use with Superior Secure Vent 4. 5 7. 5 Rigid Vent System (4 1 2 inch inner diameter and 7 1 2 inch outer diameter) Specifications Item Number SV4. 5E90 Catalog Number 77L77 Product