The NIBCO cast bronze DWV reducing coupling is used in residential and commercial drain, waste and vent systems. The reducing coupling features solder cups. The fitting provides a means of connecting larger size tube to smaller size tube. 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-year limited warranty. Because of its longstanding reputation for innovation and precision in design and manufacturing, NIBCO is the preferred brand in the industry.

• Dezincification resistant
• ASTM B584 Alloy C84400
• Material and workmanship per ASME B16.23
• Size range 3" to 4"