B&K 3/4" Rubber Washer for Dielectric Union is designed as a rubber washer for dielectric unions. Made from durable black Buna-N rubber, this washer excellent resistance to various fluids, ensuring a long-lasting and reliable performance. Dielectric unions are essential for joining pipes made of different metals to prevent galvanic corrosion, and this rubber washer helps create a tight, leak- seal within the union. By using this washer, you can maintain the effectiveness of your dielectric union in protecting your pipes from corrosion and extending their lifespan. Model Number: 888-240