Head Gasket / Kohler 52 041 20-SPack Size:1Ariens 20643600, Gravely 050449, Gravely 049449, Kohler 52 041 20, Kohler 52 041 18, Kohler 52 052 04, Kohler 52 041 20-SJ. Thomas KH-04120, Laser L5715, Laser 94507, NHC 266-4030, Oregon 50-043, Prime Line 7-02449, Prime Line 7-02406, Ratio Parts 14-039, Sunbelt KO-20, Sunbelt B1K020Gravely M18, M20, KT17, KT19 and KT21; Kohler M18, M20, KT17, KT19 and KT21Material: Metal, Ethanol: Not compatible with greater than 10% ethanol fuel