ProLine Galvanized Dielectric Union, 3/4 In. FIP x 3/4 In. Copper Sweat is expertly designed to prevent electrolysis or galvanic action when connecting different metals in plumbing systems. This union is i for joining galvanized pipes to copper pipes, two metals that can cause corrosion if they come into direct contact. By incorporating a non-conductive material to separate the metals, it effectively reduces the risk of corrosion and extends the life of your plumbing system. Suitable for use with water temperatures up to 210 degrees Fahrenheit, this union works well in a variety of hot and cold water applications. The ProLine Galvanized Dielectric Union a dependable and efficient solution for connecting dissimilar pipes while protecting your plumbing investment. Model Number: 168-004NL