The Fel-Pro BS40427 Engine Gasket Rear Main Seal is a high-quality gasket designed specifically for sealing the rear main area of an engine. Manufactured by Fel-Pro, this gasket is reliable and durable, providing a secure seal to prevent oil leaks and maintain proper engine function. The part number BS40427 indicates the specific model and fitment for compatibility with various car and truck engines. This rear main seal gasket is essential for maintaining the integrity and performance of the engine's rear main seal.