The API Flange Adapter Spool is a robust and reliable component designed for high-performance piping systems. Made from AISI 4130 alloy steel, it offers exceptional strength and resistance to wear and tear. With a flange size of 3-1/8 inches (5K) x 2-1/16 inches (3K), this spool is suitable for a variety of applications. It comes complete with ring gaskets, bolts, and nuts, ensuring a secure and leak-free connection.