Southland 1/2 In. Malleable Iron Galvanized Lock Nut is crafted from durable galvanized malleable iron, ensuring long-lasting strength and reliability. This lock nut features the Mueller logo cast into the body, signifying its ity and quality. Each fitting is individually flag tagged for easy identification and has undergone thorough inspection and quality testing to dependable performance in your projects. Model Number: 510-903HC