This paper gasket seals the gearbox housing, preventing oil leakage and blocking the entry of contaminants into the transmission. It is installed between the gearbox casing and its mating cover, where it compresses under bolt torque to form a static seal. A compromised gasket allows oil seepage, which can lead to low lubricant levels and accelerated gear or bearing wear. This component is manufactured to the original material specification, matching the thickness and compressibility required for proper sealing without over-stressing the housing flanges. On reinstallation, clean both mating surfaces thoroughly and tighten the housing bolts to the specified torque.