1-1/2 Black UnionThe 1 1 2 Black Union is a small pipe fitting used to connect two pipes or tubing sections of the same diameter while allowing for easy disconnection. These unions are typically made of black iron, black steel, or black brass, commonly used in plumbing, gas, and industrial applications. Made from malleable iron for long lasting performance. Specification Details TYPE Black Union DESIGN Hex Nut or Round nut determines the ease of tightening with