The Light Duty Straight O Ring External Hexagonal Plug is designed to seal the auxiliary sea water pump ports to prevent leaks. Maintaining a secure seal, ensures the efficient and reliable operation of marine engines and cooling systems, contributing to their longevity and performance.Attributes:• Ensures exact fit and reliable performance.• External hexagonal shape for easy tool engagement.• Provides a tight seal to prevent leaks.• Withstands vibrations and pressure fluctuations.Applications: The Light Duty Straight O Ring External Hexagonal Plug is located and placed at the port openings of the auxiliary sea water pump, sealing them to prevent fluid leaks and maintain system integrity.