The SEALFAST 4 1/2" F NST X 2 1/2" DBL M NST fitting is designed for reliable connections in firefighting and industrial applications. Featuring a female to male National Standard Thread (NST) configuration, this fitting ensures compatibility with a wide range of hoses and equipment. Constructed from high-strength materials, it offers excellent resistance to corrosion and wear, making it suitable for long-term use in demanding environments. Its precise dimensions guarantee a secure fit, ensuring optimal performance in high-pressure situations.