Southland 1/2" Ground Joint Black Iron Union is a high-quality black malleable iron union featuring an inserted brass seat for enhanced durability and a secure fit. Each fitting is individually flag-tagged and proudly displays the Mueller logo cast into the body, ensuring ity and superior craftsmanship. Imported and rigorously inspected, these unions undergo thorough quality testing to reliable performance. They are i for plumbing and gas applications where a secure, leak- connection is essential. Model Number: 521-703BG