The Highcraft Dielectric Union is constructed of a highly-durable brass to help minimize corrosion. The union is designed to transition between steel and copper piping. Equipped with a 3/4 inch FIP(female inlet pipe) x 3/4 inch press connection. The IPS connection and nut are both constructed of steel. Create a strong, reliable, and watertight seal in seconds. Certified for use in potable water applications. The dielectric union works well with copper, brass, and steel. Meets lead-free industry standards.