Southland 1-1/2" Ground Joint Black Iron Union is a high-quality black malleable iron union featuring an inserted brass seat for enhanced durability. 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. I for plumbing and gas applications, they provide a secure, leak- connection that professionals trust. Model Number: 521-707BG