Centek 45-degree fiberglass elbow used to allow for a change in direction of engine exhaust where exhaust hose may buckle or resist flow. 3.50 in. Fiberglass Exhaust Elbow - 45 Degree | Centek Industries 1200111 Centek Marine 3.5 inch 45-degree fiberglass elbow Ideal for marine exhaust connections For use with 3.5 in. inside diameter hose Made from the same corrosion resistant high-temperature resin used in Vernatube 10.25 in. length