The Eastman 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 female Iron pipe (FIP) x 3/4 inch solder connection. The IPS connection and nut are both constructed of steel. The maximum PSI is 250 and is rate to a maximum of 180-degrees Fahrenheit. The union includes a gasket that is made of silicone rubber and a nylon insert. The dielectric union works well with copper, brass, and steel. Meets lead-free industry standards.