Pack of 5 Gasket Shift Gear Box (Oval) For 105-135 Gear Box of 4 Stroke (178F, 186F, 188F & 177F) Power Tiller is a set of oval-shaped sealing gaskets designed for the shift gearbox of micro tillers using 4-stroke engines. These gaskets are essential for forming an oil-tight seal, preventing leaks and protecting gear mechanisms from dust and contamination during heavy agricultural use.