Replaces carbon steel ball valves, gate valves and eccentric plug valves. With 80000 psi tensile strength, it's stronger than steel. Ductile iron easily out-performs carbon steel in water applications. With dramatically lower torque and the corrosion-resistance of PFA fused 0.008 in into the solid stainless steel ball, you'll understand why thousands of valve buyers have switched to the 4000D.