Cast iron pipes continue to play an important role in modern drainage and building infrastructure because of their strength, durability, fire resistance, and long service life. With IS 3989:2024 replacing the earlier 2009 edition, buyers now have an updated reference for centrifugally cast iron spigot-and-socket pipes, fittings, and accessories. Understanding what the revised standard means can help project owners make more informed purchasing decisions. What Is IS 3989:2024?