B&K 3/4 In. Malleable Black Iron Coupling is a durable and strong pipe fitting made from malleable black iron, i for various plumbing and industrial uses. This coupling is designed to connect two black iron pipes in a straight line, providing a secure and leak-proof connection that ensures smooth and efficient flow of liquids or gases. It has been inspected and quality tested to meet industry standards. Known for its corrosion resistance and ability to withstand high pressures and temperatures, black iron is commonly used in plumbing systems for both indoor and outdoor applications. This coupling long-lasting performance you can rely on. Model Number: 521-204BG