Discover the Professional Brass Backed Nitrile Rubber Seal for Hammer Union in Black Color. Designed for hammer union-style pipe connections, this seal ensures leak-proof flow lines in the oil drilling industry. With a pressure rating of 15,000 PSI and tested to 22,500 PSI, it's perfect for standard and sour gas service. Available in various sizes and materials, including brass and stainless steel backups.