Part 25 313 01-S, 2531301S, 2531301-S, For Kohler CH5, CH6, CH11, CH12.5, CH13, CH14, CH15, CH15ST, CH26, CH410, CH430, CH450, M8, M10, M12, M14, M16, TH16, TH18 Engines. This is the rubber bushing part that creates a tight seal between the fuel tank outlet hole and fuel shut off valve.