Left Right Hand Thread. Great for closed pipe structures. NPT threads. 1/2 inch in size, with one having a standard thread, and the other a left-handed thread. The fitting is made of malleable iron, with a black coating, and is suitable for applications with pressures up to 150 lb. It is produced in a Iso9001:2000 manufacturing environment and was pressure tested before leaving the factory. Ul/ulc and fm approved the designed for meeting the astm a-197 and ansi/asme B16.3 and B16.14 standards.