2P8912 Elbow Fits Caterpillar SR4One New Aftermarket Replacement Exhaust Manifold Elbow Fits Caterpillar (Fits CAT) Engines and Equipment This exhaust manifold elbow is a direct fit replacement Fits Caterpillar engines and equipment powered by the 3304 engine family. The elbow connects to the exhaust manifold and routes exhaust gases away from the engine, and is a critical component in maintaining proper exhaust flow and engine cooling. Specifications Flange: 4. 25 in. Weight: 13. 9