The double tee features solder cups. This fitting allows for a connection to be made in continuous pipeline and branch out in two different directions. Please refer to NIBCO technical data sheets and catalogs for engineering and installation information, in addition to special made-to-order products. 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-year limited warranty. Because of its longstanding reputation for innovation and precision in design and manufacturing, NIBCO is the preferred brand in the industry.