The SEALCON LLC part NN-09-BK is a high-quality black nylon locking nut specifically designed for use with 3/8" NPT connectors. This locking nut provides a secure and tight seal when used in combination with other SEALCON components, ensuring leak-free connections and preventing loosening over time. The durable black nylon construction offers exceptional resistance to corrosion, chemicals, and extreme temperatures, making it ideal for a wide range of industrial and commercial applications. Trust in the reliability and performance of SEALCON LLC's NN-09-BK black nylon locking nut to ensure the integrity and longevity of your plumbing and piping systems.