Muffler Ex Pipe Gasket Fits Honda Engine GX240, GX270, GX340 & GX390, OEM # 18333-Z1C-801, 18333-ZE3-800, 18333-ZK6-Y00, Oregon 50-426, Stens 486-507 Muffler Ex Pipe Gasket Fits Honda Engine GX 240, GX 270, GX 340 & GX 390 Muffler Gasket for Honda Muffler Ex Pipe Gasket Fits Honda 8 HP, 9 HP & 11 HP & 13 HP OEM # 18333-Z1C-801, 18333-ZE3-800, 18333-ZK6-Y00 Replacement Part for Oregon 50-426, Stens 486-507