The SEALFAST 2 1/2" NST Cap & Chain is a robust solution for securing fire hydrants and other water systems. Constructed from durable materials, this cap features a National Standard Thread (NST) design, ensuring compatibility with standard fittings. The included chain prevents loss and provides easy access during emergencies. With a 2 1/2" diameter, it is ideal for municipal and industrial applications, meeting compliance standards for safety and reliability. This cap is essential for maintaining the integrity of water systems and ensuring quick response in fire situations.