This Corteco seal ring fits in the fuel system of the host tractor or vehicle. It sits between two stationary components to prevent fuel leakage at the joint. The seal is a precision-molded oil seal that maintains a tight barrier against fluid migration under normal operating pressure. A worn or hardened seal allows fuel seepage, which can cause pressure loss and air ingress into the system. The manufacturer machines the seal to match the original housing's groove geometry, ensuring it seats correctly without additional shimming or modification. On replacement, clean the mating surfaces and install the seal dry or with a light film of clean fuel, depending on the housing design.