The Union features a solder cup and MNPT threads. The fitting is used to allow repair to the line without damage as well as adapt from a solder connection to a threaded connection. Please refer to NIBCO® technical data sheets and catalogs for engineering and installation information. In addition to its inherent qualities of beauty, durability and low maintenance, copper's reusability makes it an ideal application in sustainable projects. NIBCO® copper fittings are manufactured in an ISO 9001 certified facility and backed by a 50 years limited warranty. Because of its longstanding reputation for innovation and precision in design and manufacturing, NIBCO® is the preferred brand in the industry.