*PLUMBERSSTOCK EXPERT* responded:
No, it will not. According to the manufacturer, brass flanges are used for copper most of the time. This Jones Stephens C40320 3X2 Quick Connect Closet Flange will not work for 3-inch copper pipes but it will work for 3-inch cast iron or plastic pipes. Please see this specification sheet for reference. Cast iron pipes are known for their high impact resistance and tensile strength and plastic pipes are also known for their very good resistance against corrosion, chemicals, and shock, making them popular in the plumbing industry. If you really want to go for copper, you may try the Merit Brass XB235-48 threaded brass flange that has a pipe size of 3 inches. Uploading this product's information on PlumbersStock.com is an ongoing process but you can already place the order! Just have the product number ready and contact one of our customer service representatives at 435-868-4020 between 8:00 AM and 7:00 PM MT or through e-mail at firstname.lastname@example.org. Thank you for shopping!