Rotary Inlet Needle Kit for Tecumseh 631021 When installing the rubber seat, install with the groove facing the carburetor Not compatible with greater than 10% ethanol fuel for float carburetors Tecumseh HMSK, HSSK, LEV, LH, LV, OH195, OHH, OHM120, OVRM120, V40, V50, V60, VM80, H30 and VM100