The SEALFAST 4 1/2" F NST X 2 1/2" DBL F NST fitting is engineered for secure connections in firefighting and industrial applications. This fitting features a female National Standard Thread (NST) design, ensuring compatibility with standard hoses and equipment. Constructed from durable materials, it offers excellent resistance to corrosion and wear, making it suitable for long-term use. The dimensions provide a reliable fit for various systems, ensuring optimal performance in high-pressure environments. Ideal for fire departments and industrial settings, this fitting meets industry standards for safety and reliability.