The CORTECO Crankshaft Seal, part number 12001381B, is a critical component for the proper functioning of your vehicle's manual transmission. Engineered to precise specifications, this seal is designed to prevent oil or other lubricants from leaking out of the transmission housing, particularly around the crankshaft. A failing crankshaft seal can lead to significant issues, including low fluid levels, potential damage to other transmission components due to lack of lubrication, and environmental concerns from leaks. Replacing a worn or damaged seal with a high-quality part like this CORTECO seal is essential for maintaining the integrity and longevity of your transmission. CORTECO is known for its commitment to quality and reliability in sealing solutions. This specific seal is manufactured to meet or exceed original equipment standards, ensuring a proper fit and durable performance. Its robust construction is designed to withstand the demanding conditions within a transmission, including varying temperatures and pressures.