S410195117006 Seal, primary oil deflector rubber chain lube tube

Keeping the primary chain properly lubricated is vital, and that starts with a good seal on the oil deflector tube. This Athena rubber seal is designed to fit inside the inner primary cover, specifically sealing the primary chain lubrication tube. It is a critical component for 1939 to 1954 Big Twin OHV models and 1939 to 1948 Big Twin Flatheads. With approximate dimensions of 3/8" ID by 0.88" OD and a thickness of .020", it provides the exact fit required for these vintage machines. This part is a direct replacement for OEM 24931-39 and 543-39. When you are servicing the primary on a Knucklehead or early Panhead, ensuring this small rubber deflector seal is fresh will help maintain proper oil flow and prevent internal pressure issues.