The SEALFAST 2 1/2" F NST X 1 1/2" M NST coupling is perfect for connecting hoses and pipes in fire protection and irrigation systems. Featuring a female National Standard Thread (NST) on one end and a male NST on the other, this coupling ensures a secure and leak-proof connection. Constructed from robust materials, it is designed to withstand harsh conditions and provide long-lasting performance. The dimensions allow for easy handling and installation, making it a reliable choice for both commercial and residential applications.