The female adapter features a solder cup and female NPT thread. These fittings provide a means for adapting a solder connection to a threaded connection. 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.