Compatible with 3/4-inch NPT connections, this bronze flange set is suitable for UP and UPS circulator pumps. It includes all necessary components such as flanges, gaskets, and hardware, ensuring a complete installation for hydronic heating or hot water systems. The durable bronze construction provides reliable performance and longevity in various applications. With a length of 4-1/4 inches, this kit is designed for easy integration into existing setups.